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Commit | Line | Data |
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718e3744 | 1 | /* Kernel communication using netlink interface. |
2 | * Copyright (C) 1999 Kunihiro Ishiguro | |
3 | * | |
4 | * This file is part of GNU Zebra. | |
5 | * | |
6 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
896014f4 DL |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
718e3744 | 19 | */ |
1fdc9eae | 20 | |
21 | #include <zebra.h> | |
22 | ||
ddfeb486 DL |
23 | #ifdef HAVE_NETLINK |
24 | ||
1fdc9eae | 25 | #include "linklist.h" |
26 | #include "if.h" | |
27 | #include "log.h" | |
28 | #include "prefix.h" | |
29 | #include "connected.h" | |
30 | #include "table.h" | |
31 | #include "memory.h" | |
1fdc9eae | 32 | #include "rib.h" |
33 | #include "thread.h" | |
34 | #include "privs.h" | |
35 | #include "nexthop.h" | |
36 | #include "vrf.h" | |
37 | #include "mpls.h" | |
174482ef | 38 | #include "lib_errors.h" |
d4000d7b | 39 | #include "hash.h" |
1fdc9eae | 40 | |
3801e764 | 41 | #include "zebra/zebra_router.h" |
1fdc9eae | 42 | #include "zebra/zebra_ns.h" |
43 | #include "zebra/zebra_vrf.h" | |
05f7f5db | 44 | #include "zebra/rt.h" |
1fdc9eae | 45 | #include "zebra/debug.h" |
46 | #include "zebra/kernel_netlink.h" | |
47 | #include "zebra/rt_netlink.h" | |
48 | #include "zebra/if_netlink.h" | |
942bf97b | 49 | #include "zebra/rule_netlink.h" |
449a30ed | 50 | #include "zebra/tc_netlink.h" |
ebb61fca | 51 | #include "zebra/netconf_netlink.h" |
43e52561 | 52 | #include "zebra/zebra_errors.h" |
1fdc9eae | 53 | |
54 | #ifndef SO_RCVBUFFORCE | |
55 | #define SO_RCVBUFFORCE (33) | |
56 | #endif | |
57 | ||
58 | /* Hack for GNU libc version 2. */ | |
59 | #ifndef MSG_TRUNC | |
60 | #define MSG_TRUNC 0x20 | |
61 | #endif /* MSG_TRUNC */ | |
62 | ||
63 | #ifndef NLMSG_TAIL | |
d62a17ae | 64 | #define NLMSG_TAIL(nmsg) \ |
d7c0a89a QY |
65 | ((struct rtattr *)(((uint8_t *)(nmsg)) \ |
66 | + NLMSG_ALIGN((nmsg)->nlmsg_len))) | |
1fdc9eae | 67 | #endif |
68 | ||
69 | #ifndef RTA_TAIL | |
d62a17ae | 70 | #define RTA_TAIL(rta) \ |
d7c0a89a | 71 | ((struct rtattr *)(((uint8_t *)(rta)) + RTA_ALIGN((rta)->rta_len))) |
1fdc9eae | 72 | #endif |
73 | ||
f909c673 DS |
74 | #ifndef RTNL_FAMILY_IP6MR |
75 | #define RTNL_FAMILY_IP6MR 129 | |
76 | #endif | |
77 | ||
78 | #ifndef RTPROT_MROUTED | |
79 | #define RTPROT_MROUTED 17 | |
80 | #endif | |
81 | ||
531c92b8 | 82 | #define NL_DEFAULT_BATCH_BUFSIZE (16 * NL_PKT_BUF_SIZE) |
e63c7622 JU |
83 | |
84 | /* | |
85 | * We limit the batch's size to a number smaller than the length of the | |
86 | * underlying buffer since the last message that wouldn't fit the batch would go | |
87 | * over the upper boundary and then it would have to be encoded again into a new | |
88 | * buffer. If the difference between the limit and the length of the buffer is | |
89 | * big enough (bigger than the biggest Netlink message) then this situation | |
90 | * won't occur. | |
91 | */ | |
531c92b8 JU |
92 | #define NL_DEFAULT_BATCH_SEND_THRESHOLD (15 * NL_PKT_BUF_SIZE) |
93 | ||
d62a17ae | 94 | static const struct message nlmsg_str[] = {{RTM_NEWROUTE, "RTM_NEWROUTE"}, |
95 | {RTM_DELROUTE, "RTM_DELROUTE"}, | |
96 | {RTM_GETROUTE, "RTM_GETROUTE"}, | |
97 | {RTM_NEWLINK, "RTM_NEWLINK"}, | |
5d414138 | 98 | {RTM_SETLINK, "RTM_SETLINK"}, |
d62a17ae | 99 | {RTM_DELLINK, "RTM_DELLINK"}, |
100 | {RTM_GETLINK, "RTM_GETLINK"}, | |
101 | {RTM_NEWADDR, "RTM_NEWADDR"}, | |
102 | {RTM_DELADDR, "RTM_DELADDR"}, | |
103 | {RTM_GETADDR, "RTM_GETADDR"}, | |
104 | {RTM_NEWNEIGH, "RTM_NEWNEIGH"}, | |
105 | {RTM_DELNEIGH, "RTM_DELNEIGH"}, | |
106 | {RTM_GETNEIGH, "RTM_GETNEIGH"}, | |
942bf97b | 107 | {RTM_NEWRULE, "RTM_NEWRULE"}, |
108 | {RTM_DELRULE, "RTM_DELRULE"}, | |
109 | {RTM_GETRULE, "RTM_GETRULE"}, | |
79580b5a SW |
110 | {RTM_NEWNEXTHOP, "RTM_NEWNEXTHOP"}, |
111 | {RTM_DELNEXTHOP, "RTM_DELNEXTHOP"}, | |
112 | {RTM_GETNEXTHOP, "RTM_GETNEXTHOP"}, | |
ebb61fca DS |
113 | {RTM_NEWNETCONF, "RTM_NEWNETCONF"}, |
114 | {RTM_DELNETCONF, "RTM_DELNETCONF"}, | |
acc8e687 CS |
115 | {RTM_NEWTUNNEL, "RTM_NEWTUNNEL"}, |
116 | {RTM_DELTUNNEL, "RTM_DELTUNNEL"}, | |
117 | {RTM_GETTUNNEL, "RTM_GETTUNNEL"}, | |
449a30ed SY |
118 | {RTM_NEWQDISC, "RTM_NEWQDISC"}, |
119 | {RTM_DELQDISC, "RTM_DELQDISC"}, | |
120 | {RTM_GETQDISC, "RTM_GETQDISC"}, | |
121 | {RTM_NEWTCLASS, "RTM_NEWTCLASS"}, | |
122 | {RTM_DELTCLASS, "RTM_DELTCLASS"}, | |
123 | {RTM_GETTCLASS, "RTM_GETTCLASS"}, | |
124 | {RTM_NEWTFILTER, "RTM_NEWTFILTER"}, | |
125 | {RTM_DELTFILTER, "RTM_DELTFILTER"}, | |
126 | {RTM_GETTFILTER, "RTM_GETTFILTER"}, | |
d62a17ae | 127 | {0}}; |
1fdc9eae | 128 | |
129 | static const struct message rtproto_str[] = { | |
d62a17ae | 130 | {RTPROT_REDIRECT, "redirect"}, |
131 | {RTPROT_KERNEL, "kernel"}, | |
132 | {RTPROT_BOOT, "boot"}, | |
133 | {RTPROT_STATIC, "static"}, | |
134 | {RTPROT_GATED, "GateD"}, | |
135 | {RTPROT_RA, "router advertisement"}, | |
136 | {RTPROT_MRT, "MRT"}, | |
137 | {RTPROT_ZEBRA, "Zebra"}, | |
1fdc9eae | 138 | #ifdef RTPROT_BIRD |
d62a17ae | 139 | {RTPROT_BIRD, "BIRD"}, |
1fdc9eae | 140 | #endif /* RTPROT_BIRD */ |
d62a17ae | 141 | {RTPROT_MROUTED, "mroute"}, |
142 | {RTPROT_BGP, "BGP"}, | |
143 | {RTPROT_OSPF, "OSPF"}, | |
144 | {RTPROT_ISIS, "IS-IS"}, | |
145 | {RTPROT_RIP, "RIP"}, | |
146 | {RTPROT_RIPNG, "RIPNG"}, | |
d4d71f11 | 147 | {RTPROT_ZSTATIC, "static"}, |
d62a17ae | 148 | {0}}; |
149 | ||
150 | static const struct message family_str[] = {{AF_INET, "ipv4"}, | |
151 | {AF_INET6, "ipv6"}, | |
152 | {AF_BRIDGE, "bridge"}, | |
153 | {RTNL_FAMILY_IPMR, "ipv4MR"}, | |
154 | {RTNL_FAMILY_IP6MR, "ipv6MR"}, | |
155 | {0}}; | |
156 | ||
8c8f250b DS |
157 | static const struct message rttype_str[] = {{RTN_UNSPEC, "none"}, |
158 | {RTN_UNICAST, "unicast"}, | |
159 | {RTN_LOCAL, "local"}, | |
160 | {RTN_BROADCAST, "broadcast"}, | |
161 | {RTN_ANYCAST, "anycast"}, | |
d62a17ae | 162 | {RTN_MULTICAST, "multicast"}, |
8c8f250b DS |
163 | {RTN_BLACKHOLE, "blackhole"}, |
164 | {RTN_UNREACHABLE, "unreachable"}, | |
165 | {RTN_PROHIBIT, "prohibited"}, | |
166 | {RTN_THROW, "throw"}, | |
167 | {RTN_NAT, "nat"}, | |
168 | {RTN_XRESOLVE, "resolver"}, | |
d62a17ae | 169 | {0}}; |
b339bde7 | 170 | |
1fdc9eae | 171 | extern struct thread_master *master; |
1fdc9eae | 172 | |
173 | extern struct zebra_privs_t zserv_privs; | |
174 | ||
bf8d3d6a | 175 | DEFINE_MTYPE_STATIC(ZEBRA, NL_BUF, "Zebra Netlink buffers"); |
531c92b8 | 176 | |
34869809 MS |
177 | /* Hashtable and mutex to allow lookup of nlsock structs by socket/fd value. |
178 | * We have both the main and dplane pthreads using these structs, so we have | |
179 | * to protect the hash with a lock. | |
180 | */ | |
181 | static struct hash *nlsock_hash; | |
182 | pthread_mutex_t nlsock_mutex; | |
183 | ||
184 | /* Lock and unlock wrappers for nlsock hash */ | |
185 | #define NLSOCK_LOCK() pthread_mutex_lock(&nlsock_mutex) | |
186 | #define NLSOCK_UNLOCK() pthread_mutex_unlock(&nlsock_mutex) | |
187 | ||
531c92b8 JU |
188 | size_t nl_batch_tx_bufsize; |
189 | char *nl_batch_tx_buf; | |
190 | ||
531c92b8 JU |
191 | _Atomic uint32_t nl_batch_bufsize = NL_DEFAULT_BATCH_BUFSIZE; |
192 | _Atomic uint32_t nl_batch_send_threshold = NL_DEFAULT_BATCH_SEND_THRESHOLD; | |
193 | ||
e63c7622 JU |
194 | struct nl_batch { |
195 | void *buf; | |
196 | size_t bufsiz; | |
197 | size_t limit; | |
198 | ||
199 | void *buf_head; | |
200 | size_t curlen; | |
201 | size_t msgcnt; | |
202 | ||
203 | const struct zebra_dplane_info *zns; | |
e63c7622 | 204 | |
ac96497c | 205 | struct dplane_ctx_list_head ctx_list; |
e63c7622 | 206 | |
f6feb48b JU |
207 | /* |
208 | * Pointer to the queue of completed contexts outbound back | |
209 | * towards the dataplane module. | |
210 | */ | |
ac96497c | 211 | struct dplane_ctx_list_head *ctx_out_q; |
e63c7622 JU |
212 | }; |
213 | ||
531c92b8 JU |
214 | int netlink_config_write_helper(struct vty *vty) |
215 | { | |
216 | uint32_t size = | |
217 | atomic_load_explicit(&nl_batch_bufsize, memory_order_relaxed); | |
218 | uint32_t threshold = atomic_load_explicit(&nl_batch_send_threshold, | |
219 | memory_order_relaxed); | |
220 | ||
221 | if (size != NL_DEFAULT_BATCH_BUFSIZE | |
222 | || threshold != NL_DEFAULT_BATCH_SEND_THRESHOLD) | |
223 | vty_out(vty, "zebra kernel netlink batch-tx-buf %u %u\n", size, | |
224 | threshold); | |
225 | ||
c40e1b1c SW |
226 | if (if_netlink_frr_protodown_r_bit_is_set()) |
227 | vty_out(vty, "zebra protodown reason-bit %u\n", | |
228 | if_netlink_get_frr_protodown_r_bit()); | |
229 | ||
531c92b8 JU |
230 | return 0; |
231 | } | |
232 | ||
233 | void netlink_set_batch_buffer_size(uint32_t size, uint32_t threshold, bool set) | |
234 | { | |
235 | if (!set) { | |
236 | size = NL_DEFAULT_BATCH_BUFSIZE; | |
237 | threshold = NL_DEFAULT_BATCH_SEND_THRESHOLD; | |
238 | } | |
239 | ||
240 | atomic_store_explicit(&nl_batch_bufsize, size, memory_order_relaxed); | |
241 | atomic_store_explicit(&nl_batch_send_threshold, threshold, | |
242 | memory_order_relaxed); | |
243 | } | |
244 | ||
2414abd3 | 245 | int netlink_talk_filter(struct nlmsghdr *h, ns_id_t ns_id, int startup) |
1fdc9eae | 246 | { |
3575d9e8 DS |
247 | /* |
248 | * This is an error condition that must be handled during | |
249 | * development. | |
250 | * | |
251 | * The netlink_talk_filter function is used for communication | |
252 | * down the netlink_cmd pipe and we are expecting | |
253 | * an ack being received. So if we get here | |
254 | * then we did not receive the ack and instead | |
255 | * received some other message in an unexpected | |
256 | * way. | |
257 | */ | |
43e52561 QY |
258 | zlog_debug("%s: ignoring message type 0x%04x(%s) NS %u", __func__, |
259 | h->nlmsg_type, nl_msg_type_to_str(h->nlmsg_type), ns_id); | |
d62a17ae | 260 | return 0; |
1fdc9eae | 261 | } |
262 | ||
d62a17ae | 263 | static int netlink_recvbuf(struct nlsock *nl, uint32_t newsize) |
1fdc9eae | 264 | { |
d7c0a89a | 265 | uint32_t oldsize; |
d62a17ae | 266 | socklen_t newlen = sizeof(newsize); |
267 | socklen_t oldlen = sizeof(oldsize); | |
268 | int ret; | |
269 | ||
270 | ret = getsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, &oldsize, &oldlen); | |
271 | if (ret < 0) { | |
450971aa | 272 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
273 | "Can't get %s receive buffer size: %s", nl->name, |
274 | safe_strerror(errno)); | |
d62a17ae | 275 | return -1; |
276 | } | |
277 | ||
278 | /* Try force option (linux >= 2.6.14) and fall back to normal set */ | |
0cf6db21 | 279 | frr_with_privs(&zserv_privs) { |
01b9e3fd | 280 | ret = setsockopt(nl->sock, SOL_SOCKET, SO_RCVBUFFORCE, |
9fb83b55 | 281 | &rcvbufsize, sizeof(rcvbufsize)); |
01b9e3fd | 282 | } |
d62a17ae | 283 | if (ret < 0) |
9fb83b55 DS |
284 | ret = setsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, &rcvbufsize, |
285 | sizeof(rcvbufsize)); | |
d62a17ae | 286 | if (ret < 0) { |
450971aa | 287 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
288 | "Can't set %s receive buffer size: %s", nl->name, |
289 | safe_strerror(errno)); | |
d62a17ae | 290 | return -1; |
291 | } | |
292 | ||
293 | ret = getsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, &newsize, &newlen); | |
294 | if (ret < 0) { | |
450971aa | 295 | flog_err_sys(EC_LIB_SOCKET, |
09c866e3 QY |
296 | "Can't get %s receive buffer size: %s", nl->name, |
297 | safe_strerror(errno)); | |
d62a17ae | 298 | return -1; |
299 | } | |
d62a17ae | 300 | return 0; |
1fdc9eae | 301 | } |
302 | ||
fe953d7c DS |
303 | static const char *group2str(uint32_t group) |
304 | { | |
305 | switch (group) { | |
306 | case RTNLGRP_TUNNEL: | |
307 | return "RTNLGRP_TUNNEL"; | |
308 | default: | |
309 | return "UNKNOWN"; | |
310 | } | |
311 | } | |
312 | ||
1fdc9eae | 313 | /* Make socket for Linux netlink interface. */ |
d62a17ae | 314 | static int netlink_socket(struct nlsock *nl, unsigned long groups, |
fe953d7c DS |
315 | uint32_t ext_groups[], uint8_t ext_group_size, |
316 | ns_id_t ns_id) | |
1fdc9eae | 317 | { |
d62a17ae | 318 | int ret; |
319 | struct sockaddr_nl snl; | |
320 | int sock; | |
321 | int namelen; | |
d62a17ae | 322 | |
0cf6db21 | 323 | frr_with_privs(&zserv_privs) { |
6bb30c2c DL |
324 | sock = ns_socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE, ns_id); |
325 | if (sock < 0) { | |
326 | zlog_err("Can't open %s socket: %s", nl->name, | |
327 | safe_strerror(errno)); | |
328 | return -1; | |
329 | } | |
d62a17ae | 330 | |
0d6f7fd6 | 331 | memset(&snl, 0, sizeof(snl)); |
6bb30c2c DL |
332 | snl.nl_family = AF_NETLINK; |
333 | snl.nl_groups = groups; | |
d62a17ae | 334 | |
fe953d7c DS |
335 | if (ext_group_size) { |
336 | uint8_t i; | |
337 | ||
338 | for (i = 0; i < ext_group_size; i++) { | |
cc408c06 | 339 | #if defined SOL_NETLINK |
fe953d7c DS |
340 | ret = setsockopt(sock, SOL_NETLINK, |
341 | NETLINK_ADD_MEMBERSHIP, | |
342 | &ext_groups[i], | |
343 | sizeof(ext_groups[i])); | |
344 | if (ret < 0) { | |
345 | zlog_notice( | |
346 | "can't setsockopt NETLINK_ADD_MEMBERSHIP for group %s(%u), this linux kernel does not support it: %s(%d)", | |
347 | group2str(ext_groups[i]), | |
348 | ext_groups[i], | |
349 | safe_strerror(errno), errno); | |
350 | } | |
cc408c06 DS |
351 | #else |
352 | zlog_notice( | |
353 | "Unable to use NETLINK_ADD_MEMBERSHIP via SOL_NETLINK for %s(%u) since the linux kernel does not support the socket option", | |
354 | group2str(ext_groups[i]), | |
355 | ext_groups[i]); | |
356 | #endif | |
e5b1de8a CS |
357 | } |
358 | } | |
47e2eb27 | 359 | |
6bb30c2c | 360 | /* Bind the socket to the netlink structure for anything. */ |
0d6f7fd6 | 361 | ret = bind(sock, (struct sockaddr *)&snl, sizeof(snl)); |
6bb30c2c | 362 | } |
d62a17ae | 363 | |
364 | if (ret < 0) { | |
6bb30c2c DL |
365 | zlog_err("Can't bind %s socket to group 0x%x: %s", nl->name, |
366 | snl.nl_groups, safe_strerror(errno)); | |
d62a17ae | 367 | close(sock); |
368 | return -1; | |
369 | } | |
370 | ||
371 | /* multiple netlink sockets will have different nl_pid */ | |
0d6f7fd6 | 372 | namelen = sizeof(snl); |
d62a17ae | 373 | ret = getsockname(sock, (struct sockaddr *)&snl, (socklen_t *)&namelen); |
0d6f7fd6 | 374 | if (ret < 0 || namelen != sizeof(snl)) { |
450971aa | 375 | flog_err_sys(EC_LIB_SOCKET, "Can't get %s socket name: %s", |
09c866e3 | 376 | nl->name, safe_strerror(errno)); |
d62a17ae | 377 | close(sock); |
378 | return -1; | |
379 | } | |
380 | ||
381 | nl->snl = snl; | |
382 | nl->sock = sock; | |
2cf7651f DS |
383 | nl->buflen = NL_RCV_PKT_BUF_SIZE; |
384 | nl->buf = XMALLOC(MTYPE_NL_BUF, nl->buflen); | |
385 | ||
d62a17ae | 386 | return ret; |
1fdc9eae | 387 | } |
388 | ||
d166308b MS |
389 | /* |
390 | * Dispatch an incoming netlink message; used by the zebra main pthread's | |
391 | * netlink event reader. | |
392 | */ | |
2414abd3 | 393 | static int netlink_information_fetch(struct nlmsghdr *h, ns_id_t ns_id, |
d62a17ae | 394 | int startup) |
1fdc9eae | 395 | { |
3575d9e8 DS |
396 | /* |
397 | * When we handle new message types here | |
398 | * because we are starting to install them | |
399 | * then lets check the netlink_install_filter | |
400 | * and see if we should add the corresponding | |
401 | * allow through entry there. | |
402 | * Probably not needed to do but please | |
403 | * think about it. | |
404 | */ | |
d62a17ae | 405 | switch (h->nlmsg_type) { |
406 | case RTM_NEWROUTE: | |
2414abd3 | 407 | return netlink_route_change(h, ns_id, startup); |
d62a17ae | 408 | case RTM_DELROUTE: |
2414abd3 | 409 | return netlink_route_change(h, ns_id, startup); |
d62a17ae | 410 | case RTM_NEWLINK: |
2414abd3 | 411 | return netlink_link_change(h, ns_id, startup); |
d62a17ae | 412 | case RTM_DELLINK: |
2414abd3 | 413 | return netlink_link_change(h, ns_id, startup); |
d62a17ae | 414 | case RTM_NEWNEIGH: |
d62a17ae | 415 | case RTM_DELNEIGH: |
951f8bcb | 416 | case RTM_GETNEIGH: |
7a52f27e | 417 | return netlink_neigh_change(h, ns_id); |
942bf97b | 418 | case RTM_NEWRULE: |
2414abd3 | 419 | return netlink_rule_change(h, ns_id, startup); |
942bf97b | 420 | case RTM_DELRULE: |
2414abd3 | 421 | return netlink_rule_change(h, ns_id, startup); |
79580b5a | 422 | case RTM_NEWNEXTHOP: |
d9f5b2f5 | 423 | return netlink_nexthop_change(h, ns_id, startup); |
79580b5a | 424 | case RTM_DELNEXTHOP: |
d9f5b2f5 | 425 | return netlink_nexthop_change(h, ns_id, startup); |
c317d3f2 SY |
426 | case RTM_NEWQDISC: |
427 | case RTM_DELQDISC: | |
428 | return netlink_qdisc_change(h, ns_id, startup); | |
429 | case RTM_NEWTCLASS: | |
430 | case RTM_DELTCLASS: | |
431 | return netlink_tclass_change(h, ns_id, startup); | |
432 | case RTM_NEWTFILTER: | |
433 | case RTM_DELTFILTER: | |
434 | return netlink_tfilter_change(h, ns_id, startup); | |
d166308b MS |
435 | |
436 | /* Messages handled in the dplane thread */ | |
437 | case RTM_NEWADDR: | |
438 | case RTM_DELADDR: | |
cd787a8a MS |
439 | case RTM_NEWNETCONF: |
440 | case RTM_DELNETCONF: | |
acc8e687 CS |
441 | case RTM_NEWTUNNEL: |
442 | case RTM_DELTUNNEL: | |
443 | case RTM_GETTUNNEL: | |
d166308b | 444 | return 0; |
d62a17ae | 445 | default: |
3575d9e8 DS |
446 | /* |
447 | * If we have received this message then | |
448 | * we have made a mistake during development | |
449 | * and we need to write some code to handle | |
450 | * this message type or not ask for | |
451 | * it to be sent up to us | |
452 | */ | |
e914ccbe | 453 | flog_err(EC_ZEBRA_UNKNOWN_NLMSG, |
1d5453d6 | 454 | "Unknown netlink nlmsg_type %s(%d) vrf %u", |
1c50c1c0 QY |
455 | nl_msg_type_to_str(h->nlmsg_type), h->nlmsg_type, |
456 | ns_id); | |
d62a17ae | 457 | break; |
458 | } | |
459 | return 0; | |
1fdc9eae | 460 | } |
461 | ||
d166308b MS |
462 | /* |
463 | * Dispatch an incoming netlink message; used by the dataplane pthread's | |
464 | * netlink event reader code. | |
465 | */ | |
466 | static int dplane_netlink_information_fetch(struct nlmsghdr *h, ns_id_t ns_id, | |
467 | int startup) | |
468 | { | |
469 | /* | |
470 | * Dispatch the incoming messages that the dplane pthread handles | |
471 | */ | |
472 | switch (h->nlmsg_type) { | |
473 | case RTM_NEWADDR: | |
474 | case RTM_DELADDR: | |
475 | return netlink_interface_addr_dplane(h, ns_id, startup); | |
476 | ||
9f3f1486 MS |
477 | case RTM_NEWNETCONF: |
478 | case RTM_DELNETCONF: | |
479 | return netlink_netconf_change(h, ns_id, startup); | |
480 | ||
481 | /* TODO -- other messages for the dplane socket and pthread */ | |
482 | ||
d166308b MS |
483 | case RTM_NEWLINK: |
484 | case RTM_DELLINK: | |
485 | ||
486 | default: | |
487 | break; | |
488 | } | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
cc9f21da | 493 | static void kernel_read(struct thread *thread) |
1fdc9eae | 494 | { |
d62a17ae | 495 | struct zebra_ns *zns = (struct zebra_ns *)THREAD_ARG(thread); |
85a75f1e MS |
496 | struct zebra_dplane_info dp_info; |
497 | ||
498 | /* Capture key info from ns struct */ | |
499 | zebra_dplane_info_from_zns(&dp_info, zns, false); | |
500 | ||
501 | netlink_parse_info(netlink_information_fetch, &zns->netlink, &dp_info, | |
9bfadae8 | 502 | 5, false); |
d166308b | 503 | |
3801e764 | 504 | thread_add_read(zrouter.master, kernel_read, zns, zns->netlink.sock, |
d62a17ae | 505 | &zns->t_netlink); |
1fdc9eae | 506 | } |
507 | ||
d166308b MS |
508 | /* |
509 | * Called by the dplane pthread to read incoming OS messages and dispatch them. | |
510 | */ | |
511 | int kernel_dplane_read(struct zebra_dplane_info *info) | |
512 | { | |
d4000d7b DS |
513 | struct nlsock *nl = kernel_netlink_nlsock_lookup(info->sock); |
514 | ||
515 | netlink_parse_info(dplane_netlink_information_fetch, nl, info, 5, | |
516 | false); | |
d166308b MS |
517 | |
518 | return 0; | |
519 | } | |
520 | ||
3575d9e8 DS |
521 | /* |
522 | * Filter out messages from self that occur on listener socket, | |
62b8bb7a | 523 | * caused by our actions on the command socket(s) |
3575d9e8 DS |
524 | * |
525 | * When we add new Netlink message types we probably | |
526 | * do not need to add them here as that we are filtering | |
527 | * on the routes we actually care to receive( which is rarer | |
528 | * then the normal course of operations). We are intentionally | |
529 | * allowing some messages from ourselves through | |
530 | * ( I'm looking at you Interface based netlink messages ) | |
9f3f1486 MS |
531 | * so that we only have to write one way to handle incoming |
532 | * address add/delete and xxxNETCONF changes. | |
1fdc9eae | 533 | */ |
ff45112c | 534 | static void netlink_install_filter(int sock, uint32_t pid, uint32_t dplane_pid) |
1fdc9eae | 535 | { |
3575d9e8 DS |
536 | /* |
537 | * BPF_JUMP instructions and where you jump to are based upon | |
538 | * 0 as being the next statement. So count from 0. Writing | |
539 | * this down because every time I look at this I have to | |
540 | * re-remember it. | |
541 | */ | |
d62a17ae | 542 | struct sock_filter filter[] = { |
3575d9e8 DS |
543 | /* |
544 | * Logic: | |
62b8bb7a MS |
545 | * if (nlmsg_pid == pid || |
546 | * nlmsg_pid == dplane_pid) { | |
3575d9e8 | 547 | * if (the incoming nlmsg_type == |
9f3f1486 MS |
548 | * RTM_NEWADDR || RTM_DELADDR || RTM_NEWNETCONF || |
549 | * RTM_DELNETCONF) | |
3575d9e8 DS |
550 | * keep this message |
551 | * else | |
552 | * skip this message | |
553 | * } else | |
554 | * keep this netlink message | |
555 | */ | |
556 | /* | |
557 | * 0: Load the nlmsg_pid into the BPF register | |
558 | */ | |
d62a17ae | 559 | BPF_STMT(BPF_LD | BPF_ABS | BPF_W, |
560 | offsetof(struct nlmsghdr, nlmsg_pid)), | |
3575d9e8 DS |
561 | /* |
562 | * 1: Compare to pid | |
563 | */ | |
62b8bb7a | 564 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htonl(pid), 1, 0), |
3575d9e8 | 565 | /* |
62b8bb7a MS |
566 | * 2: Compare to dplane pid |
567 | */ | |
9f3f1486 | 568 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htonl(dplane_pid), 0, 6), |
62b8bb7a MS |
569 | /* |
570 | * 3: Load the nlmsg_type into BPF register | |
3575d9e8 DS |
571 | */ |
572 | BPF_STMT(BPF_LD | BPF_ABS | BPF_H, | |
573 | offsetof(struct nlmsghdr, nlmsg_type)), | |
574 | /* | |
62b8bb7a | 575 | * 4: Compare to RTM_NEWADDR |
3575d9e8 | 576 | */ |
9f3f1486 | 577 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htons(RTM_NEWADDR), 4, 0), |
3575d9e8 | 578 | /* |
62b8bb7a | 579 | * 5: Compare to RTM_DELADDR |
3575d9e8 | 580 | */ |
9f3f1486 MS |
581 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htons(RTM_DELADDR), 3, 0), |
582 | /* | |
583 | * 6: Compare to RTM_NEWNETCONF | |
584 | */ | |
585 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htons(RTM_NEWNETCONF), 2, | |
586 | 0), | |
587 | /* | |
588 | * 7: Compare to RTM_DELNETCONF | |
589 | */ | |
590 | BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, htons(RTM_DELNETCONF), 1, | |
591 | 0), | |
3575d9e8 | 592 | /* |
9f3f1486 | 593 | * 8: This is the end state of we want to skip the |
3575d9e8 DS |
594 | * message |
595 | */ | |
d62a17ae | 596 | BPF_STMT(BPF_RET | BPF_K, 0), |
9f3f1486 | 597 | /* 9: This is the end state of we want to keep |
3575d9e8 DS |
598 | * the message |
599 | */ | |
d62a17ae | 600 | BPF_STMT(BPF_RET | BPF_K, 0xffff), |
601 | }; | |
602 | ||
603 | struct sock_fprog prog = { | |
9d303b37 | 604 | .len = array_size(filter), .filter = filter, |
d62a17ae | 605 | }; |
606 | ||
607 | if (setsockopt(sock, SOL_SOCKET, SO_ATTACH_FILTER, &prog, sizeof(prog)) | |
608 | < 0) | |
1d5453d6 | 609 | flog_err_sys(EC_LIB_SOCKET, "Can't install socket filter: %s", |
9df414fe | 610 | safe_strerror(errno)); |
1fdc9eae | 611 | } |
612 | ||
d166308b MS |
613 | void netlink_parse_rtattr_flags(struct rtattr **tb, int max, struct rtattr *rta, |
614 | int len, unsigned short flags) | |
4bcdb608 NA |
615 | { |
616 | unsigned short type; | |
617 | ||
269b69d7 | 618 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); |
4bcdb608 NA |
619 | while (RTA_OK(rta, len)) { |
620 | type = rta->rta_type & ~flags; | |
621 | if ((type <= max) && (!tb[type])) | |
622 | tb[type] = rta; | |
623 | rta = RTA_NEXT(rta, len); | |
624 | } | |
625 | } | |
626 | ||
d62a17ae | 627 | void netlink_parse_rtattr(struct rtattr **tb, int max, struct rtattr *rta, |
628 | int len) | |
1fdc9eae | 629 | { |
269b69d7 | 630 | memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); |
d62a17ae | 631 | while (RTA_OK(rta, len)) { |
632 | if (rta->rta_type <= max) | |
633 | tb[rta->rta_type] = rta; | |
634 | rta = RTA_NEXT(rta, len); | |
635 | } | |
1fdc9eae | 636 | } |
637 | ||
87da6a60 SW |
638 | /** |
639 | * netlink_parse_rtattr_nested() - Parses a nested route attribute | |
640 | * @tb: Pointer to array for storing rtattr in. | |
641 | * @max: Max number to store. | |
642 | * @rta: Pointer to rtattr to look for nested items in. | |
643 | */ | |
644 | void netlink_parse_rtattr_nested(struct rtattr **tb, int max, | |
645 | struct rtattr *rta) | |
646 | { | |
647 | netlink_parse_rtattr(tb, max, RTA_DATA(rta), RTA_PAYLOAD(rta)); | |
648 | } | |
649 | ||
f8f3e484 CS |
650 | bool nl_addraw_l(struct nlmsghdr *n, unsigned int maxlen, const void *data, |
651 | unsigned int len) | |
652 | { | |
653 | if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) { | |
1b3cf91b | 654 | zlog_err("ERROR message exceeded bound of %d", maxlen); |
f8f3e484 CS |
655 | return false; |
656 | } | |
657 | ||
658 | memcpy(NLMSG_TAIL(n), data, len); | |
659 | memset((uint8_t *)NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len); | |
660 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len); | |
661 | ||
662 | return true; | |
663 | } | |
664 | ||
312a6bee JU |
665 | bool nl_attr_put(struct nlmsghdr *n, unsigned int maxlen, int type, |
666 | const void *data, unsigned int alen) | |
1fdc9eae | 667 | { |
d62a17ae | 668 | int len; |
669 | struct rtattr *rta; | |
1fdc9eae | 670 | |
d62a17ae | 671 | len = RTA_LENGTH(alen); |
1fdc9eae | 672 | |
d62a17ae | 673 | if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) |
312a6bee | 674 | return false; |
1fdc9eae | 675 | |
d62a17ae | 676 | rta = (struct rtattr *)(((char *)n) + NLMSG_ALIGN(n->nlmsg_len)); |
677 | rta->rta_type = type; | |
678 | rta->rta_len = len; | |
4b2792b5 | 679 | |
d62a17ae | 680 | if (data) |
681 | memcpy(RTA_DATA(rta), data, alen); | |
682 | else | |
683 | assert(alen == 0); | |
4b2792b5 | 684 | |
d62a17ae | 685 | n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len); |
1fdc9eae | 686 | |
312a6bee | 687 | return true; |
1fdc9eae | 688 | } |
689 | ||
94d70a65 DS |
690 | bool nl_attr_put8(struct nlmsghdr *n, unsigned int maxlen, int type, |
691 | uint8_t data) | |
692 | { | |
693 | return nl_attr_put(n, maxlen, type, &data, sizeof(uint8_t)); | |
694 | } | |
695 | ||
312a6bee JU |
696 | bool nl_attr_put16(struct nlmsghdr *n, unsigned int maxlen, int type, |
697 | uint16_t data) | |
bbc16902 | 698 | { |
312a6bee | 699 | return nl_attr_put(n, maxlen, type, &data, sizeof(uint16_t)); |
bbc16902 | 700 | } |
701 | ||
312a6bee JU |
702 | bool nl_attr_put32(struct nlmsghdr *n, unsigned int maxlen, int type, |
703 | uint32_t data) | |
1fdc9eae | 704 | { |
312a6bee | 705 | return nl_attr_put(n, maxlen, type, &data, sizeof(uint32_t)); |
1fdc9eae | 706 | } |
707 | ||
312a6bee | 708 | struct rtattr *nl_attr_nest(struct nlmsghdr *n, unsigned int maxlen, int type) |
1fdc9eae | 709 | { |
d62a17ae | 710 | struct rtattr *nest = NLMSG_TAIL(n); |
1fdc9eae | 711 | |
312a6bee JU |
712 | if (!nl_attr_put(n, maxlen, type, NULL, 0)) |
713 | return NULL; | |
714 | ||
40d86eba | 715 | nest->rta_type |= NLA_F_NESTED; |
d62a17ae | 716 | return nest; |
1fdc9eae | 717 | } |
718 | ||
312a6bee | 719 | int nl_attr_nest_end(struct nlmsghdr *n, struct rtattr *nest) |
1fdc9eae | 720 | { |
d7c0a89a | 721 | nest->rta_len = (uint8_t *)NLMSG_TAIL(n) - (uint8_t *)nest; |
d62a17ae | 722 | return n->nlmsg_len; |
1fdc9eae | 723 | } |
724 | ||
312a6bee | 725 | struct rtnexthop *nl_attr_rtnh(struct nlmsghdr *n, unsigned int maxlen) |
1fdc9eae | 726 | { |
312a6bee | 727 | struct rtnexthop *rtnh = (struct rtnexthop *)NLMSG_TAIL(n); |
1fdc9eae | 728 | |
312a6bee JU |
729 | if (NLMSG_ALIGN(n->nlmsg_len) + RTNH_ALIGN(sizeof(struct rtnexthop)) |
730 | > maxlen) | |
731 | return NULL; | |
732 | ||
733 | memset(rtnh, 0, sizeof(struct rtnexthop)); | |
734 | n->nlmsg_len = | |
735 | NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(sizeof(struct rtnexthop)); | |
736 | ||
737 | return rtnh; | |
1fdc9eae | 738 | } |
739 | ||
312a6bee | 740 | void nl_attr_rtnh_end(struct nlmsghdr *n, struct rtnexthop *rtnh) |
1fdc9eae | 741 | { |
312a6bee | 742 | rtnh->rtnh_len = (uint8_t *)NLMSG_TAIL(n) - (uint8_t *)rtnh; |
1fdc9eae | 743 | } |
744 | ||
f8f3e484 CS |
745 | bool nl_rta_put(struct rtattr *rta, unsigned int maxlen, int type, |
746 | const void *data, int alen) | |
747 | { | |
748 | struct rtattr *subrta; | |
749 | int len = RTA_LENGTH(alen); | |
750 | ||
751 | if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) { | |
752 | zlog_err("ERROR max allowed bound %d exceeded for rtattr", | |
753 | maxlen); | |
754 | return false; | |
755 | } | |
756 | subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len)); | |
757 | subrta->rta_type = type; | |
758 | subrta->rta_len = len; | |
759 | if (alen) | |
760 | memcpy(RTA_DATA(subrta), data, alen); | |
761 | rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len); | |
762 | ||
763 | return true; | |
764 | } | |
765 | ||
766 | bool nl_rta_put16(struct rtattr *rta, unsigned int maxlen, int type, | |
767 | uint16_t data) | |
768 | { | |
769 | return nl_rta_put(rta, maxlen, type, &data, sizeof(uint16_t)); | |
770 | } | |
771 | ||
772 | bool nl_rta_put64(struct rtattr *rta, unsigned int maxlen, int type, | |
773 | uint64_t data) | |
774 | { | |
775 | return nl_rta_put(rta, maxlen, type, &data, sizeof(uint64_t)); | |
776 | } | |
777 | ||
778 | struct rtattr *nl_rta_nest(struct rtattr *rta, unsigned int maxlen, int type) | |
779 | { | |
780 | struct rtattr *nest = RTA_TAIL(rta); | |
781 | ||
782 | if (nl_rta_put(rta, maxlen, type, NULL, 0)) | |
783 | return NULL; | |
784 | ||
785 | nest->rta_type |= NLA_F_NESTED; | |
786 | ||
787 | return nest; | |
788 | } | |
789 | ||
790 | int nl_rta_nest_end(struct rtattr *rta, struct rtattr *nest) | |
791 | { | |
792 | nest->rta_len = (uint8_t *)RTA_TAIL(rta) - (uint8_t *)nest; | |
793 | ||
794 | return rta->rta_len; | |
795 | } | |
796 | ||
d62a17ae | 797 | const char *nl_msg_type_to_str(uint16_t msg_type) |
1fdc9eae | 798 | { |
d62a17ae | 799 | return lookup_msg(nlmsg_str, msg_type, ""); |
1fdc9eae | 800 | } |
801 | ||
d7c0a89a | 802 | const char *nl_rtproto_to_str(uint8_t rtproto) |
1fdc9eae | 803 | { |
d62a17ae | 804 | return lookup_msg(rtproto_str, rtproto, ""); |
1fdc9eae | 805 | } |
b339bde7 | 806 | |
d7c0a89a | 807 | const char *nl_family_to_str(uint8_t family) |
b339bde7 | 808 | { |
d62a17ae | 809 | return lookup_msg(family_str, family, ""); |
b339bde7 DS |
810 | } |
811 | ||
d7c0a89a | 812 | const char *nl_rttype_to_str(uint8_t rttype) |
b339bde7 | 813 | { |
d62a17ae | 814 | return lookup_msg(rttype_str, rttype, ""); |
b339bde7 DS |
815 | } |
816 | ||
4cebb2b6 | 817 | #define NLA_OK(nla, len) \ |
5d307d5d DS |
818 | ((len) >= (int)sizeof(struct nlattr) \ |
819 | && (nla)->nla_len >= sizeof(struct nlattr) \ | |
820 | && (nla)->nla_len <= (len)) | |
4cebb2b6 SW |
821 | #define NLA_NEXT(nla, attrlen) \ |
822 | ((attrlen) -= NLA_ALIGN((nla)->nla_len), \ | |
823 | (struct nlattr *)(((char *)(nla)) + NLA_ALIGN((nla)->nla_len))) | |
824 | #define NLA_LENGTH(len) (NLA_ALIGN(sizeof(struct nlattr)) + (len)) | |
825 | #define NLA_DATA(nla) ((struct nlattr *)(((char *)(nla)) + NLA_LENGTH(0))) | |
826 | ||
827 | #define ERR_NLA(err, inner_len) \ | |
828 | ((struct nlattr *)(((char *)(err)) \ | |
829 | + NLMSG_ALIGN(sizeof(struct nlmsgerr)) \ | |
830 | + NLMSG_ALIGN((inner_len)))) | |
5d307d5d DS |
831 | |
832 | static void netlink_parse_nlattr(struct nlattr **tb, int max, | |
833 | struct nlattr *nla, int len) | |
834 | { | |
4cebb2b6 | 835 | while (NLA_OK(nla, len)) { |
5d307d5d DS |
836 | if (nla->nla_type <= max) |
837 | tb[nla->nla_type] = nla; | |
4cebb2b6 | 838 | nla = NLA_NEXT(nla, len); |
5d307d5d DS |
839 | } |
840 | } | |
841 | ||
842 | static void netlink_parse_extended_ack(struct nlmsghdr *h) | |
843 | { | |
4cebb2b6 SW |
844 | struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {}; |
845 | const struct nlmsgerr *err = (const struct nlmsgerr *)NLMSG_DATA(h); | |
5d307d5d | 846 | const struct nlmsghdr *err_nlh = NULL; |
4cebb2b6 SW |
847 | /* Length not including nlmsghdr */ |
848 | uint32_t len = 0; | |
849 | /* Inner error netlink message length */ | |
850 | uint32_t inner_len = 0; | |
5d307d5d DS |
851 | const char *msg = NULL; |
852 | uint32_t off = 0; | |
853 | ||
854 | if (!(h->nlmsg_flags & NLM_F_CAPPED)) | |
4cebb2b6 SW |
855 | inner_len = (uint32_t)NLMSG_PAYLOAD(&err->msg, 0); |
856 | ||
857 | len = (uint32_t)(NLMSG_PAYLOAD(h, sizeof(struct nlmsgerr)) - inner_len); | |
5d307d5d | 858 | |
4cebb2b6 SW |
859 | netlink_parse_nlattr(tb, NLMSGERR_ATTR_MAX, ERR_NLA(err, inner_len), |
860 | len); | |
5d307d5d DS |
861 | |
862 | if (tb[NLMSGERR_ATTR_MSG]) | |
4cebb2b6 | 863 | msg = (const char *)NLA_DATA(tb[NLMSGERR_ATTR_MSG]); |
5d307d5d DS |
864 | |
865 | if (tb[NLMSGERR_ATTR_OFFS]) { | |
4cebb2b6 | 866 | off = *(uint32_t *)NLA_DATA(tb[NLMSGERR_ATTR_OFFS]); |
5d307d5d DS |
867 | |
868 | if (off > h->nlmsg_len) { | |
9165c5f5 | 869 | zlog_err("Invalid offset for NLMSGERR_ATTR_OFFS"); |
5d307d5d DS |
870 | } else if (!(h->nlmsg_flags & NLM_F_CAPPED)) { |
871 | /* | |
872 | * Header of failed message | |
873 | * we are not doing anything currently with it | |
874 | * but noticing it for later. | |
875 | */ | |
876 | err_nlh = &err->msg; | |
15569c58 | 877 | zlog_debug("%s: Received %s extended Ack", __func__, |
87b5d1b0 | 878 | nl_msg_type_to_str(err_nlh->nlmsg_type)); |
5d307d5d DS |
879 | } |
880 | } | |
881 | ||
882 | if (msg && *msg != '\0') { | |
883 | bool is_err = !!err->error; | |
884 | ||
885 | if (is_err) | |
886 | zlog_err("Extended Error: %s", msg); | |
887 | else | |
e914ccbe | 888 | flog_warn(EC_ZEBRA_NETLINK_EXTENDED_WARNING, |
9df414fe | 889 | "Extended Warning: %s", msg); |
5d307d5d DS |
890 | } |
891 | } | |
892 | ||
ae6138bf JU |
893 | /* |
894 | * netlink_send_msg - send a netlink message of a certain size. | |
895 | * | |
896 | * Returns -1 on error. Otherwise, it returns the number of bytes sent. | |
897 | */ | |
f8653393 JU |
898 | static ssize_t netlink_send_msg(const struct nlsock *nl, void *buf, |
899 | size_t buflen) | |
ae6138bf | 900 | { |
f8653393 JU |
901 | struct sockaddr_nl snl = {}; |
902 | struct iovec iov = {}; | |
903 | struct msghdr msg = {}; | |
904 | ssize_t status; | |
905 | int save_errno = 0; | |
ae6138bf JU |
906 | |
907 | iov.iov_base = buf; | |
908 | iov.iov_len = buflen; | |
f8653393 | 909 | msg.msg_name = &snl; |
ae6138bf JU |
910 | msg.msg_namelen = sizeof(snl); |
911 | msg.msg_iov = &iov; | |
912 | msg.msg_iovlen = 1; | |
913 | ||
914 | snl.nl_family = AF_NETLINK; | |
915 | ||
916 | /* Send message to netlink interface. */ | |
917 | frr_with_privs(&zserv_privs) { | |
918 | status = sendmsg(nl->sock, &msg, 0); | |
919 | save_errno = errno; | |
920 | } | |
921 | ||
922 | if (IS_ZEBRA_DEBUG_KERNEL_MSGDUMP_SEND) { | |
923 | zlog_debug("%s: >> netlink message dump [sent]", __func__); | |
eead0bc4 RZ |
924 | #ifdef NETLINK_DEBUG |
925 | nl_dump(buf, buflen); | |
926 | #else | |
ae6138bf | 927 | zlog_hexdump(buf, buflen); |
eead0bc4 | 928 | #endif /* NETLINK_DEBUG */ |
ae6138bf JU |
929 | } |
930 | ||
f8653393 | 931 | if (status == -1) { |
ae6138bf JU |
932 | flog_err_sys(EC_LIB_SOCKET, "%s error: %s", __func__, |
933 | safe_strerror(save_errno)); | |
934 | return -1; | |
935 | } | |
936 | ||
937 | return status; | |
938 | } | |
939 | ||
940 | /* | |
941 | * netlink_recv_msg - receive a netlink message. | |
942 | * | |
943 | * Returns -1 on error, 0 if read would block or the number of bytes received. | |
944 | */ | |
2cf7651f | 945 | static int netlink_recv_msg(struct nlsock *nl, struct msghdr *msg) |
ae6138bf JU |
946 | { |
947 | struct iovec iov; | |
948 | int status; | |
949 | ||
2cf7651f DS |
950 | iov.iov_base = nl->buf; |
951 | iov.iov_len = nl->buflen; | |
952 | msg->msg_iov = &iov; | |
953 | msg->msg_iovlen = 1; | |
ae6138bf JU |
954 | |
955 | do { | |
2cf7651f DS |
956 | int bytes; |
957 | ||
958 | bytes = recv(nl->sock, NULL, 0, MSG_PEEK | MSG_TRUNC); | |
959 | ||
960 | if (bytes >= 0 && (size_t)bytes > nl->buflen) { | |
961 | nl->buf = XREALLOC(MTYPE_NL_BUF, nl->buf, bytes); | |
962 | nl->buflen = bytes; | |
963 | iov.iov_base = nl->buf; | |
964 | iov.iov_len = nl->buflen; | |
965 | } | |
966 | ||
967 | status = recvmsg(nl->sock, msg, 0); | |
f8653393 | 968 | } while (status == -1 && errno == EINTR); |
ae6138bf | 969 | |
f8653393 | 970 | if (status == -1) { |
ae6138bf JU |
971 | if (errno == EWOULDBLOCK || errno == EAGAIN) |
972 | return 0; | |
973 | flog_err(EC_ZEBRA_RECVMSG_OVERRUN, "%s recvmsg overrun: %s", | |
974 | nl->name, safe_strerror(errno)); | |
975 | /* | |
976 | * In this case we are screwed. There is no good way to recover | |
977 | * zebra at this point. | |
978 | */ | |
979 | exit(-1); | |
980 | } | |
981 | ||
982 | if (status == 0) { | |
983 | flog_err_sys(EC_LIB_SOCKET, "%s EOF", nl->name); | |
984 | return -1; | |
985 | } | |
986 | ||
2cf7651f | 987 | if (msg->msg_namelen != sizeof(struct sockaddr_nl)) { |
ae6138bf JU |
988 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, |
989 | "%s sender address length error: length %d", nl->name, | |
2cf7651f | 990 | msg->msg_namelen); |
ae6138bf JU |
991 | return -1; |
992 | } | |
993 | ||
994 | if (IS_ZEBRA_DEBUG_KERNEL_MSGDUMP_RECV) { | |
995 | zlog_debug("%s: << netlink message dump [recv]", __func__); | |
eead0bc4 | 996 | #ifdef NETLINK_DEBUG |
2cf7651f | 997 | nl_dump(nl->buf, status); |
eead0bc4 | 998 | #else |
2cf7651f | 999 | zlog_hexdump(nl->buf, status); |
eead0bc4 | 1000 | #endif /* NETLINK_DEBUG */ |
ae6138bf JU |
1001 | } |
1002 | ||
ae6138bf JU |
1003 | return status; |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * netlink_parse_error - parse a netlink error message | |
1008 | * | |
1009 | * Returns 1 if this message is acknowledgement, 0 if this error should be | |
1010 | * ignored, -1 otherwise. | |
1011 | */ | |
1012 | static int netlink_parse_error(const struct nlsock *nl, struct nlmsghdr *h, | |
d166308b | 1013 | bool is_cmd, bool startup) |
ae6138bf JU |
1014 | { |
1015 | struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); | |
1016 | int errnum = err->error; | |
1017 | int msg_type = err->msg.nlmsg_type; | |
1018 | ||
1019 | if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) { | |
1020 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, | |
1021 | "%s error: message truncated", nl->name); | |
1022 | return -1; | |
1023 | } | |
1024 | ||
1025 | /* | |
1026 | * Parse the extended information before we actually handle it. At this | |
1027 | * point in time we do not do anything other than report the issue. | |
1028 | */ | |
1029 | if (h->nlmsg_flags & NLM_F_ACK_TLVS) | |
1030 | netlink_parse_extended_ack(h); | |
1031 | ||
1032 | /* If the error field is zero, then this is an ACK. */ | |
1033 | if (err->error == 0) { | |
1034 | if (IS_ZEBRA_DEBUG_KERNEL) { | |
1035 | zlog_debug("%s: %s ACK: type=%s(%u), seq=%u, pid=%u", | |
1036 | __func__, nl->name, | |
1037 | nl_msg_type_to_str(err->msg.nlmsg_type), | |
1038 | err->msg.nlmsg_type, err->msg.nlmsg_seq, | |
1039 | err->msg.nlmsg_pid); | |
1040 | } | |
1041 | ||
1042 | return 1; | |
1043 | } | |
1044 | ||
f09428e4 | 1045 | /* |
1046 | * Deal with errors that occur because of races in link handling | |
1047 | * or types are not supported in kernel. | |
1048 | */ | |
1049 | if (is_cmd && | |
1050 | ((msg_type == RTM_DELROUTE && | |
1051 | (-errnum == ENODEV || -errnum == ESRCH)) || | |
1052 | (msg_type == RTM_NEWROUTE && | |
1053 | (-errnum == ENETDOWN || -errnum == EEXIST)) || | |
1054 | ((msg_type == RTM_NEWTUNNEL || msg_type == RTM_DELTUNNEL || | |
1055 | msg_type == RTM_GETTUNNEL) && | |
1056 | (-errnum == EOPNOTSUPP)))) { | |
ae6138bf JU |
1057 | if (IS_ZEBRA_DEBUG_KERNEL) |
1058 | zlog_debug("%s: error: %s type=%s(%u), seq=%u, pid=%u", | |
1059 | nl->name, safe_strerror(-errnum), | |
1060 | nl_msg_type_to_str(msg_type), msg_type, | |
1061 | err->msg.nlmsg_seq, err->msg.nlmsg_pid); | |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * We see RTM_DELNEIGH when shutting down an interface with an IPv4 | |
1067 | * link-local. The kernel should have already deleted the neighbor so | |
1068 | * do not log these as an error. | |
1069 | */ | |
1070 | if (msg_type == RTM_DELNEIGH | |
d166308b | 1071 | || (is_cmd && msg_type == RTM_NEWROUTE |
ae6138bf JU |
1072 | && (-errnum == ESRCH || -errnum == ENETUNREACH))) { |
1073 | /* | |
1074 | * This is known to happen in some situations, don't log as | |
1075 | * error. | |
1076 | */ | |
1077 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1078 | zlog_debug("%s error: %s, type=%s(%u), seq=%u, pid=%u", | |
1079 | nl->name, safe_strerror(-errnum), | |
1080 | nl_msg_type_to_str(msg_type), msg_type, | |
1081 | err->msg.nlmsg_seq, err->msg.nlmsg_pid); | |
1082 | } else { | |
1083 | if ((msg_type != RTM_GETNEXTHOP) || !startup) | |
1084 | flog_err(EC_ZEBRA_UNEXPECTED_MESSAGE, | |
1085 | "%s error: %s, type=%s(%u), seq=%u, pid=%u", | |
1086 | nl->name, safe_strerror(-errnum), | |
1087 | nl_msg_type_to_str(msg_type), msg_type, | |
1088 | err->msg.nlmsg_seq, err->msg.nlmsg_pid); | |
1089 | } | |
1090 | ||
1091 | return -1; | |
1092 | } | |
1093 | ||
936ebf0a DS |
1094 | /* |
1095 | * netlink_parse_info | |
1096 | * | |
1097 | * Receive message from netlink interface and pass those information | |
1098 | * to the given function. | |
1099 | * | |
1100 | * filter -> Function to call to read the results | |
1101 | * nl -> netlink socket information | |
1102 | * zns -> The zebra namespace data | |
1103 | * count -> How many we should read in, 0 means as much as possible | |
1104 | * startup -> Are we reading in under startup conditions? passed to | |
1105 | * the filter. | |
1106 | */ | |
2414abd3 | 1107 | int netlink_parse_info(int (*filter)(struct nlmsghdr *, ns_id_t, int), |
2cf7651f | 1108 | struct nlsock *nl, const struct zebra_dplane_info *zns, |
9bfadae8 | 1109 | int count, bool startup) |
1fdc9eae | 1110 | { |
d62a17ae | 1111 | int status; |
1112 | int ret = 0; | |
1113 | int error; | |
1114 | int read_in = 0; | |
1115 | ||
1116 | while (1) { | |
d62a17ae | 1117 | struct sockaddr_nl snl; |
1118 | struct msghdr msg = {.msg_name = (void *)&snl, | |
ae6138bf | 1119 | .msg_namelen = sizeof(snl)}; |
d62a17ae | 1120 | struct nlmsghdr *h; |
1121 | ||
1122 | if (count && read_in >= count) | |
1123 | return 0; | |
1124 | ||
2cf7651f | 1125 | status = netlink_recv_msg(nl, &msg); |
ae6138bf | 1126 | if (status == -1) |
d62a17ae | 1127 | return -1; |
ae6138bf JU |
1128 | else if (status == 0) |
1129 | break; | |
81a2f870 | 1130 | |
d62a17ae | 1131 | read_in++; |
2cf7651f | 1132 | for (h = (struct nlmsghdr *)nl->buf; |
e6a0e0d1 | 1133 | (status >= 0 && NLMSG_OK(h, (unsigned int)status)); |
d62a17ae | 1134 | h = NLMSG_NEXT(h, status)) { |
1135 | /* Finish of reading. */ | |
1136 | if (h->nlmsg_type == NLMSG_DONE) | |
1137 | return ret; | |
1138 | ||
1139 | /* Error handling. */ | |
1140 | if (h->nlmsg_type == NLMSG_ERROR) { | |
d166308b MS |
1141 | int err = netlink_parse_error( |
1142 | nl, h, zns->is_cmd, startup); | |
1143 | ||
ae6138bf | 1144 | if (err == 1) { |
d62a17ae | 1145 | if (!(h->nlmsg_flags & NLM_F_MULTI)) |
1146 | return 0; | |
1147 | continue; | |
ae6138bf JU |
1148 | } else |
1149 | return err; | |
d62a17ae | 1150 | } |
1151 | ||
2f71996a DS |
1152 | /* |
1153 | * What is the right thing to do? The kernel | |
1154 | * is telling us that the dump request was interrupted | |
1155 | * and we more than likely are out of luck and have | |
1156 | * missed data from the kernel. At this point in time | |
1157 | * lets just note that this is happening. | |
1158 | */ | |
1159 | if (h->nlmsg_flags & NLM_F_DUMP_INTR) | |
1160 | flog_err( | |
1161 | EC_ZEBRA_NETLINK_BAD_SEQUENCE, | |
1162 | "netlink recvmsg: The Dump request was interrupted"); | |
1163 | ||
d62a17ae | 1164 | /* OK we got netlink message. */ |
1165 | if (IS_ZEBRA_DEBUG_KERNEL) | |
1166 | zlog_debug( | |
d166308b MS |
1167 | "%s: %s type %s(%u), len=%d, seq=%u, pid=%u", |
1168 | __func__, nl->name, | |
d62a17ae | 1169 | nl_msg_type_to_str(h->nlmsg_type), |
1170 | h->nlmsg_type, h->nlmsg_len, | |
1171 | h->nlmsg_seq, h->nlmsg_pid); | |
1172 | ||
783827ae DS |
1173 | |
1174 | /* | |
1175 | * Ignore messages that maybe sent from | |
1176 | * other actors besides the kernel | |
1177 | */ | |
1178 | if (snl.nl_pid != 0) { | |
43e52561 QY |
1179 | zlog_debug("Ignoring message from pid %u", |
1180 | snl.nl_pid); | |
d62a17ae | 1181 | continue; |
1182 | } | |
1183 | ||
2414abd3 | 1184 | error = (*filter)(h, zns->ns_id, startup); |
d62a17ae | 1185 | if (error < 0) { |
9df414fe QY |
1186 | zlog_debug("%s filter function error", |
1187 | nl->name); | |
d62a17ae | 1188 | ret = error; |
1189 | } | |
1190 | } | |
1191 | ||
1192 | /* After error care. */ | |
1193 | if (msg.msg_flags & MSG_TRUNC) { | |
e914ccbe | 1194 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, |
1c50c1c0 | 1195 | "%s error: message truncated", nl->name); |
d62a17ae | 1196 | continue; |
1197 | } | |
1198 | if (status) { | |
e914ccbe | 1199 | flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR, |
1c50c1c0 QY |
1200 | "%s error: data remnant size %d", nl->name, |
1201 | status); | |
d62a17ae | 1202 | return -1; |
1203 | } | |
1204 | } | |
1205 | return ret; | |
1fdc9eae | 1206 | } |
1207 | ||
936ebf0a | 1208 | /* |
7cdb1a84 | 1209 | * netlink_talk_info |
936ebf0a DS |
1210 | * |
1211 | * sendmsg() to netlink socket then recvmsg(). | |
1212 | * Calls netlink_parse_info to parse returned data | |
1213 | * | |
1214 | * filter -> The filter to read final results from kernel | |
1215 | * nlmsghdr -> The data to send to the kernel | |
8b962e77 | 1216 | * dp_info -> The dataplane and netlink socket information |
936ebf0a DS |
1217 | * startup -> Are we reading in under startup conditions |
1218 | * This is passed through eventually to filter. | |
1219 | */ | |
2cf7651f DS |
1220 | static int netlink_talk_info(int (*filter)(struct nlmsghdr *, ns_id_t, |
1221 | int startup), | |
1222 | struct nlmsghdr *n, | |
1223 | struct zebra_dplane_info *dp_info, bool startup) | |
1fdc9eae | 1224 | { |
d4000d7b | 1225 | struct nlsock *nl; |
d62a17ae | 1226 | |
d4000d7b | 1227 | nl = kernel_netlink_nlsock_lookup(dp_info->sock); |
3670f504 | 1228 | n->nlmsg_seq = dp_info->seq; |
d62a17ae | 1229 | n->nlmsg_pid = nl->snl.nl_pid; |
1230 | ||
d62a17ae | 1231 | if (IS_ZEBRA_DEBUG_KERNEL) |
1232 | zlog_debug( | |
1233 | "netlink_talk: %s type %s(%u), len=%d seq=%u flags 0x%x", | |
1234 | nl->name, nl_msg_type_to_str(n->nlmsg_type), | |
1235 | n->nlmsg_type, n->nlmsg_len, n->nlmsg_seq, | |
1236 | n->nlmsg_flags); | |
1237 | ||
f8653393 | 1238 | if (netlink_send_msg(nl, n, n->nlmsg_len) == -1) |
d62a17ae | 1239 | return -1; |
d62a17ae | 1240 | |
d62a17ae | 1241 | /* |
1242 | * Get reply from netlink socket. | |
1243 | * The reply should either be an acknowlegement or an error. | |
1244 | */ | |
7cdb1a84 MS |
1245 | return netlink_parse_info(filter, nl, dp_info, 0, startup); |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * Synchronous version of netlink_talk_info. Converts args to suit the | |
1250 | * common version, which is suitable for both sync and async use. | |
7cdb1a84 MS |
1251 | */ |
1252 | int netlink_talk(int (*filter)(struct nlmsghdr *, ns_id_t, int startup), | |
1253 | struct nlmsghdr *n, struct nlsock *nl, struct zebra_ns *zns, | |
9bfadae8 | 1254 | bool startup) |
7cdb1a84 MS |
1255 | { |
1256 | struct zebra_dplane_info dp_info; | |
1257 | ||
1258 | /* Increment sequence number before capturing snapshot of ns socket | |
1259 | * info. | |
1260 | */ | |
1261 | nl->seq++; | |
1262 | ||
1263 | /* Capture info in intermediate info struct */ | |
85a75f1e | 1264 | zebra_dplane_info_from_zns(&dp_info, zns, (nl == &(zns->netlink_cmd))); |
7cdb1a84 | 1265 | |
5709131c | 1266 | return netlink_talk_info(filter, n, &dp_info, startup); |
1fdc9eae | 1267 | } |
1268 | ||
289602d7 | 1269 | /* Issue request message to kernel via netlink socket. GET messages |
1270 | * are issued through this interface. | |
1271 | */ | |
fd3f8e52 | 1272 | int netlink_request(struct nlsock *nl, void *req) |
1fdc9eae | 1273 | { |
fd3f8e52 | 1274 | struct nlmsghdr *n = (struct nlmsghdr *)req; |
d62a17ae | 1275 | |
1276 | /* Check netlink socket. */ | |
1277 | if (nl->sock < 0) { | |
450971aa | 1278 | flog_err_sys(EC_LIB_SOCKET, "%s socket isn't active.", |
09c866e3 | 1279 | nl->name); |
d62a17ae | 1280 | return -1; |
1281 | } | |
1282 | ||
1283 | /* Fill common fields for all requests. */ | |
d62a17ae | 1284 | n->nlmsg_pid = nl->snl.nl_pid; |
1285 | n->nlmsg_seq = ++nl->seq; | |
1286 | ||
f8653393 | 1287 | if (netlink_send_msg(nl, req, n->nlmsg_len) == -1) |
d62a17ae | 1288 | return -1; |
d62a17ae | 1289 | |
1290 | return 0; | |
1fdc9eae | 1291 | } |
1292 | ||
e63c7622 JU |
1293 | static int nl_batch_read_resp(struct nl_batch *bth) |
1294 | { | |
1295 | struct nlmsghdr *h; | |
1296 | struct sockaddr_nl snl; | |
9d06e121 | 1297 | struct msghdr msg = {}; |
f6feb48b | 1298 | int status, seq; |
d4000d7b | 1299 | struct nlsock *nl; |
f6feb48b JU |
1300 | struct zebra_dplane_ctx *ctx; |
1301 | bool ignore_msg; | |
e63c7622 | 1302 | |
d4000d7b | 1303 | nl = kernel_netlink_nlsock_lookup(bth->zns->sock); |
e63c7622 JU |
1304 | |
1305 | msg.msg_name = (void *)&snl; | |
1306 | msg.msg_namelen = sizeof(snl); | |
1307 | ||
2f9dbd3a JU |
1308 | /* |
1309 | * The responses are not batched, so we need to read and process one | |
1310 | * message at a time. | |
1311 | */ | |
1312 | while (true) { | |
2cf7651f | 1313 | status = netlink_recv_msg(nl, &msg); |
00249e25 DS |
1314 | /* |
1315 | * status == -1 is a full on failure somewhere | |
1316 | * since we don't know where the problem happened | |
1317 | * we must mark all as failed | |
1318 | * | |
1319 | * Else we mark everything as worked | |
1320 | * | |
1321 | */ | |
1322 | if (status == -1 || status == 0) { | |
1323 | while ((ctx = dplane_ctx_dequeue(&(bth->ctx_list))) != | |
1324 | NULL) { | |
1325 | if (status == -1) | |
1326 | dplane_ctx_set_status( | |
1327 | ctx, | |
1328 | ZEBRA_DPLANE_REQUEST_FAILURE); | |
1329 | dplane_ctx_enqueue_tail(bth->ctx_out_q, ctx); | |
1330 | } | |
2f9dbd3a | 1331 | return status; |
00249e25 | 1332 | } |
e63c7622 | 1333 | |
2cf7651f | 1334 | h = (struct nlmsghdr *)nl->buf; |
f6feb48b JU |
1335 | ignore_msg = false; |
1336 | seq = h->nlmsg_seq; | |
e63c7622 | 1337 | /* |
f6feb48b JU |
1338 | * Find the corresponding context object. Received responses are |
1339 | * in the same order as requests we sent, so we can simply | |
1340 | * iterate over the context list and match responses with | |
1341 | * requests at same time. | |
e63c7622 | 1342 | */ |
f6feb48b | 1343 | while (true) { |
c8453cd7 DS |
1344 | ctx = dplane_ctx_get_head(&(bth->ctx_list)); |
1345 | if (ctx == NULL) { | |
1346 | /* | |
1347 | * This is a situation where we have gotten | |
1348 | * into a bad spot. We need to know that | |
1349 | * this happens( does it? ) | |
1350 | */ | |
1351 | zlog_err( | |
1352 | "%s:WARNING Received netlink Response for an error and no Contexts to associate with it", | |
1353 | __func__); | |
e63c7622 | 1354 | break; |
c8453cd7 | 1355 | } |
f6feb48b JU |
1356 | |
1357 | /* | |
1358 | * 'update' context objects take two consecutive | |
1359 | * sequence numbers. | |
1360 | */ | |
3670f504 DS |
1361 | if (dplane_ctx_is_update(ctx) && |
1362 | dplane_ctx_get_ns(ctx)->seq + 1 == seq) { | |
f6feb48b JU |
1363 | /* |
1364 | * This is the situation where we get a response | |
1365 | * to a message that should be ignored. | |
1366 | */ | |
1367 | ignore_msg = true; | |
1368 | break; | |
1369 | } | |
c8453cd7 DS |
1370 | |
1371 | ctx = dplane_ctx_dequeue(&(bth->ctx_list)); | |
1372 | dplane_ctx_enqueue_tail(bth->ctx_out_q, ctx); | |
1373 | ||
1374 | /* We have found corresponding context object. */ | |
3670f504 | 1375 | if (dplane_ctx_get_ns(ctx)->seq == seq) |
c8453cd7 DS |
1376 | break; |
1377 | ||
3670f504 | 1378 | if (dplane_ctx_get_ns(ctx)->seq > seq) |
c8453cd7 | 1379 | zlog_warn( |
b9d95135 | 1380 | "%s:WARNING Received %u is less than any context on the queue ctx->seq %u", |
c8453cd7 | 1381 | __func__, seq, |
3670f504 | 1382 | dplane_ctx_get_ns(ctx)->seq); |
e63c7622 JU |
1383 | } |
1384 | ||
c8453cd7 DS |
1385 | if (ignore_msg) { |
1386 | /* | |
1387 | * If we ignore the message due to an update | |
1388 | * above we should still fricking decode the | |
1389 | * message for our operator to understand | |
1390 | * what is going on | |
1391 | */ | |
1392 | int err = netlink_parse_error(nl, h, bth->zns->is_cmd, | |
1393 | false); | |
1394 | ||
1395 | zlog_debug("%s: netlink error message seq=%d %d", | |
1396 | __func__, h->nlmsg_seq, err); | |
f6feb48b | 1397 | continue; |
c8453cd7 | 1398 | } |
f6feb48b | 1399 | |
e63c7622 JU |
1400 | /* |
1401 | * We received a message with the sequence number that isn't | |
1402 | * associated with any dplane context object. | |
1403 | */ | |
f6feb48b | 1404 | if (ctx == NULL) { |
4c99d413 MS |
1405 | if (IS_ZEBRA_DEBUG_KERNEL) |
1406 | zlog_debug( | |
1407 | "%s: skipping unassociated response, seq number %d NS %u", | |
1408 | __func__, h->nlmsg_seq, | |
1409 | bth->zns->ns_id); | |
e63c7622 JU |
1410 | continue; |
1411 | } | |
1412 | ||
1413 | if (h->nlmsg_type == NLMSG_ERROR) { | |
d166308b MS |
1414 | int err = netlink_parse_error(nl, h, bth->zns->is_cmd, |
1415 | false); | |
e63c7622 JU |
1416 | |
1417 | if (err == -1) | |
f6feb48b JU |
1418 | dplane_ctx_set_status( |
1419 | ctx, ZEBRA_DPLANE_REQUEST_FAILURE); | |
e63c7622 | 1420 | |
4c99d413 MS |
1421 | if (IS_ZEBRA_DEBUG_KERNEL) |
1422 | zlog_debug("%s: netlink error message seq=%d ", | |
1423 | __func__, h->nlmsg_seq); | |
e63c7622 JU |
1424 | continue; |
1425 | } | |
1426 | ||
1427 | /* | |
1428 | * If we get here then we did not receive neither the ack nor | |
1429 | * the error and instead received some other message in an | |
1430 | * unexpected way. | |
1431 | */ | |
4c99d413 MS |
1432 | if (IS_ZEBRA_DEBUG_KERNEL) |
1433 | zlog_debug("%s: ignoring message type 0x%04x(%s) NS %u", | |
1434 | __func__, h->nlmsg_type, | |
1435 | nl_msg_type_to_str(h->nlmsg_type), | |
1436 | bth->zns->ns_id); | |
e63c7622 JU |
1437 | } |
1438 | ||
1439 | return 0; | |
1440 | } | |
1441 | ||
1442 | static void nl_batch_reset(struct nl_batch *bth) | |
1443 | { | |
e63c7622 JU |
1444 | bth->buf_head = bth->buf; |
1445 | bth->curlen = 0; | |
1446 | bth->msgcnt = 0; | |
1447 | bth->zns = NULL; | |
1448 | ||
ac96497c | 1449 | dplane_ctx_q_init(&(bth->ctx_list)); |
e63c7622 JU |
1450 | } |
1451 | ||
ac96497c MS |
1452 | static void nl_batch_init(struct nl_batch *bth, |
1453 | struct dplane_ctx_list_head *ctx_out_q) | |
e63c7622 | 1454 | { |
531c92b8 JU |
1455 | /* |
1456 | * If the size of the buffer has changed, free and then allocate a new | |
1457 | * one. | |
1458 | */ | |
1459 | size_t bufsize = | |
1460 | atomic_load_explicit(&nl_batch_bufsize, memory_order_relaxed); | |
1461 | if (bufsize != nl_batch_tx_bufsize) { | |
1462 | if (nl_batch_tx_buf) | |
1463 | XFREE(MTYPE_NL_BUF, nl_batch_tx_buf); | |
1464 | ||
1465 | nl_batch_tx_buf = XCALLOC(MTYPE_NL_BUF, bufsize); | |
1466 | nl_batch_tx_bufsize = bufsize; | |
1467 | } | |
1468 | ||
f6feb48b | 1469 | bth->buf = nl_batch_tx_buf; |
531c92b8 JU |
1470 | bth->bufsiz = bufsize; |
1471 | bth->limit = atomic_load_explicit(&nl_batch_send_threshold, | |
1472 | memory_order_relaxed); | |
e63c7622 | 1473 | |
f6feb48b | 1474 | bth->ctx_out_q = ctx_out_q; |
e63c7622 | 1475 | |
f6feb48b JU |
1476 | nl_batch_reset(bth); |
1477 | } | |
1478 | ||
1479 | static void nl_batch_send(struct nl_batch *bth) | |
1480 | { | |
1481 | struct zebra_dplane_ctx *ctx; | |
1482 | bool err = false; | |
e63c7622 | 1483 | |
f6feb48b | 1484 | if (bth->curlen != 0 && bth->zns != NULL) { |
d4000d7b DS |
1485 | struct nlsock *nl = |
1486 | kernel_netlink_nlsock_lookup(bth->zns->sock); | |
1487 | ||
f6feb48b JU |
1488 | if (IS_ZEBRA_DEBUG_KERNEL) |
1489 | zlog_debug("%s: %s, batch size=%zu, msg cnt=%zu", | |
d4000d7b | 1490 | __func__, nl->name, bth->curlen, |
f6feb48b | 1491 | bth->msgcnt); |
e63c7622 | 1492 | |
d4000d7b | 1493 | if (netlink_send_msg(nl, bth->buf, bth->curlen) == -1) |
e63c7622 | 1494 | err = true; |
e63c7622 | 1495 | |
f6feb48b JU |
1496 | if (!err) { |
1497 | if (nl_batch_read_resp(bth) == -1) | |
1498 | err = true; | |
1499 | } | |
1500 | } | |
e63c7622 | 1501 | |
f6feb48b JU |
1502 | /* Move remaining contexts to the outbound queue. */ |
1503 | while (true) { | |
1504 | ctx = dplane_ctx_dequeue(&(bth->ctx_list)); | |
1505 | if (ctx == NULL) | |
1506 | break; | |
e63c7622 | 1507 | |
f6feb48b JU |
1508 | if (err) |
1509 | dplane_ctx_set_status(ctx, | |
1510 | ZEBRA_DPLANE_REQUEST_FAILURE); | |
e63c7622 | 1511 | |
f6feb48b | 1512 | dplane_ctx_enqueue_tail(bth->ctx_out_q, ctx); |
e63c7622 JU |
1513 | } |
1514 | ||
1515 | nl_batch_reset(bth); | |
1516 | } | |
1517 | ||
e63c7622 JU |
1518 | enum netlink_msg_status netlink_batch_add_msg( |
1519 | struct nl_batch *bth, struct zebra_dplane_ctx *ctx, | |
1520 | ssize_t (*msg_encoder)(struct zebra_dplane_ctx *, void *, size_t), | |
f6feb48b | 1521 | bool ignore_res) |
e63c7622 JU |
1522 | { |
1523 | int seq; | |
1524 | ssize_t size; | |
1525 | struct nlmsghdr *msgh; | |
d4000d7b | 1526 | struct nlsock *nl; |
e63c7622 | 1527 | |
e63c7622 JU |
1528 | size = (*msg_encoder)(ctx, bth->buf_head, bth->bufsiz - bth->curlen); |
1529 | ||
1530 | /* | |
1531 | * If there was an error while encoding the message (other than buffer | |
1532 | * overflow) then return an error. | |
1533 | */ | |
1534 | if (size < 0) | |
1535 | return FRR_NETLINK_ERROR; | |
1536 | ||
1537 | /* | |
1538 | * If the message doesn't fit entirely in the buffer then send the batch | |
1539 | * and retry. | |
1540 | */ | |
1541 | if (size == 0) { | |
1542 | nl_batch_send(bth); | |
1543 | size = (*msg_encoder)(ctx, bth->buf_head, | |
1544 | bth->bufsiz - bth->curlen); | |
1545 | /* | |
1546 | * If the message doesn't fit in the empty buffer then just | |
1547 | * return an error. | |
1548 | */ | |
1549 | if (size <= 0) | |
1550 | return FRR_NETLINK_ERROR; | |
1551 | } | |
1552 | ||
3670f504 | 1553 | seq = dplane_ctx_get_ns(ctx)->seq; |
d4000d7b DS |
1554 | nl = kernel_netlink_nlsock_lookup(dplane_ctx_get_ns_sock(ctx)); |
1555 | ||
f6feb48b | 1556 | if (ignore_res) |
e63c7622 JU |
1557 | seq++; |
1558 | ||
1559 | msgh = (struct nlmsghdr *)bth->buf_head; | |
1560 | msgh->nlmsg_seq = seq; | |
d4000d7b | 1561 | msgh->nlmsg_pid = nl->snl.nl_pid; |
e63c7622 | 1562 | |
e63c7622 JU |
1563 | bth->zns = dplane_ctx_get_ns(ctx); |
1564 | bth->buf_head = ((char *)bth->buf_head) + size; | |
1565 | bth->curlen += size; | |
1566 | bth->msgcnt++; | |
1567 | ||
e63c7622 JU |
1568 | return FRR_NETLINK_QUEUED; |
1569 | } | |
1570 | ||
67e3369e JU |
1571 | static enum netlink_msg_status nl_put_msg(struct nl_batch *bth, |
1572 | struct zebra_dplane_ctx *ctx) | |
1573 | { | |
1574 | if (dplane_ctx_is_skip_kernel(ctx)) | |
1575 | return FRR_NETLINK_SUCCESS; | |
1576 | ||
1577 | switch (dplane_ctx_get_op(ctx)) { | |
1578 | ||
1579 | case DPLANE_OP_ROUTE_INSTALL: | |
1580 | case DPLANE_OP_ROUTE_UPDATE: | |
1581 | case DPLANE_OP_ROUTE_DELETE: | |
1582 | return netlink_put_route_update_msg(bth, ctx); | |
1583 | ||
1584 | case DPLANE_OP_NH_INSTALL: | |
1585 | case DPLANE_OP_NH_UPDATE: | |
1586 | case DPLANE_OP_NH_DELETE: | |
1587 | return netlink_put_nexthop_update_msg(bth, ctx); | |
1588 | ||
1589 | case DPLANE_OP_LSP_INSTALL: | |
1590 | case DPLANE_OP_LSP_UPDATE: | |
1591 | case DPLANE_OP_LSP_DELETE: | |
1592 | return netlink_put_lsp_update_msg(bth, ctx); | |
1593 | ||
1594 | case DPLANE_OP_PW_INSTALL: | |
1595 | case DPLANE_OP_PW_UNINSTALL: | |
1596 | return netlink_put_pw_update_msg(bth, ctx); | |
1597 | ||
1598 | case DPLANE_OP_ADDR_INSTALL: | |
1599 | case DPLANE_OP_ADDR_UNINSTALL: | |
1600 | return netlink_put_address_update_msg(bth, ctx); | |
1601 | ||
1602 | case DPLANE_OP_MAC_INSTALL: | |
1603 | case DPLANE_OP_MAC_DELETE: | |
1604 | return netlink_put_mac_update_msg(bth, ctx); | |
1605 | ||
1606 | case DPLANE_OP_NEIGH_INSTALL: | |
1607 | case DPLANE_OP_NEIGH_UPDATE: | |
1608 | case DPLANE_OP_NEIGH_DELETE: | |
1609 | case DPLANE_OP_VTEP_ADD: | |
1610 | case DPLANE_OP_VTEP_DELETE: | |
d68e74b4 | 1611 | case DPLANE_OP_NEIGH_DISCOVER: |
0a27a2fe PG |
1612 | case DPLANE_OP_NEIGH_IP_INSTALL: |
1613 | case DPLANE_OP_NEIGH_IP_DELETE: | |
e18747a9 | 1614 | case DPLANE_OP_NEIGH_TABLE_UPDATE: |
67e3369e JU |
1615 | return netlink_put_neigh_update_msg(bth, ctx); |
1616 | ||
1617 | case DPLANE_OP_RULE_ADD: | |
1618 | case DPLANE_OP_RULE_DELETE: | |
1619 | case DPLANE_OP_RULE_UPDATE: | |
1620 | return netlink_put_rule_update_msg(bth, ctx); | |
1621 | ||
1622 | case DPLANE_OP_SYS_ROUTE_ADD: | |
1623 | case DPLANE_OP_SYS_ROUTE_DELETE: | |
1624 | case DPLANE_OP_ROUTE_NOTIFY: | |
1625 | case DPLANE_OP_LSP_NOTIFY: | |
c60522f7 | 1626 | case DPLANE_OP_BR_PORT_UPDATE: |
67e3369e JU |
1627 | return FRR_NETLINK_SUCCESS; |
1628 | ||
5162e000 PG |
1629 | case DPLANE_OP_IPTABLE_ADD: |
1630 | case DPLANE_OP_IPTABLE_DELETE: | |
ef524230 PG |
1631 | case DPLANE_OP_IPSET_ADD: |
1632 | case DPLANE_OP_IPSET_DELETE: | |
1633 | case DPLANE_OP_IPSET_ENTRY_ADD: | |
1634 | case DPLANE_OP_IPSET_ENTRY_DELETE: | |
5162e000 PG |
1635 | return FRR_NETLINK_ERROR; |
1636 | ||
62b4b7e4 PG |
1637 | case DPLANE_OP_GRE_SET: |
1638 | return netlink_put_gre_set_msg(bth, ctx); | |
1639 | ||
9d59df63 MS |
1640 | case DPLANE_OP_INTF_ADDR_ADD: |
1641 | case DPLANE_OP_INTF_ADDR_DEL: | |
67e3369e JU |
1642 | case DPLANE_OP_NONE: |
1643 | return FRR_NETLINK_ERROR; | |
5d414138 | 1644 | |
39ffa8e8 DS |
1645 | case DPLANE_OP_INTF_NETCONFIG: |
1646 | return netlink_put_intf_netconfig(bth, ctx); | |
1647 | ||
5d414138 SW |
1648 | case DPLANE_OP_INTF_INSTALL: |
1649 | case DPLANE_OP_INTF_UPDATE: | |
1650 | case DPLANE_OP_INTF_DELETE: | |
1651 | return netlink_put_intf_update_msg(bth, ctx); | |
449a30ed | 1652 | |
c317d3f2 SY |
1653 | case DPLANE_OP_TC_QDISC_INSTALL: |
1654 | case DPLANE_OP_TC_QDISC_UNINSTALL: | |
1655 | return netlink_put_tc_qdisc_update_msg(bth, ctx); | |
1656 | case DPLANE_OP_TC_CLASS_ADD: | |
1657 | case DPLANE_OP_TC_CLASS_DELETE: | |
1658 | case DPLANE_OP_TC_CLASS_UPDATE: | |
1659 | return netlink_put_tc_class_update_msg(bth, ctx); | |
1660 | case DPLANE_OP_TC_FILTER_ADD: | |
1661 | case DPLANE_OP_TC_FILTER_DELETE: | |
1662 | case DPLANE_OP_TC_FILTER_UPDATE: | |
1663 | return netlink_put_tc_filter_update_msg(bth, ctx); | |
67e3369e JU |
1664 | } |
1665 | ||
1666 | return FRR_NETLINK_ERROR; | |
1667 | } | |
1668 | ||
ac96497c | 1669 | void kernel_update_multi(struct dplane_ctx_list_head *ctx_list) |
fef24b03 | 1670 | { |
67e3369e JU |
1671 | struct nl_batch batch; |
1672 | struct zebra_dplane_ctx *ctx; | |
ac96497c | 1673 | struct dplane_ctx_list_head handled_list; |
67e3369e JU |
1674 | enum netlink_msg_status res; |
1675 | ||
ac96497c | 1676 | dplane_ctx_q_init(&handled_list); |
f6feb48b | 1677 | nl_batch_init(&batch, &handled_list); |
67e3369e JU |
1678 | |
1679 | while (true) { | |
1680 | ctx = dplane_ctx_dequeue(ctx_list); | |
1681 | if (ctx == NULL) | |
1682 | break; | |
1683 | ||
f6feb48b JU |
1684 | if (batch.zns != NULL |
1685 | && batch.zns->ns_id != dplane_ctx_get_ns(ctx)->ns_id) | |
1686 | nl_batch_send(&batch); | |
67e3369e JU |
1687 | |
1688 | /* | |
f6feb48b JU |
1689 | * Assume all messages will succeed and then mark only the ones |
1690 | * that failed. | |
67e3369e | 1691 | */ |
f6feb48b JU |
1692 | dplane_ctx_set_status(ctx, ZEBRA_DPLANE_REQUEST_SUCCESS); |
1693 | ||
1694 | res = nl_put_msg(&batch, ctx); | |
1695 | ||
1696 | dplane_ctx_enqueue_tail(&(batch.ctx_list), ctx); | |
1697 | if (res == FRR_NETLINK_ERROR) | |
67e3369e JU |
1698 | dplane_ctx_set_status(ctx, |
1699 | ZEBRA_DPLANE_REQUEST_FAILURE); | |
1700 | ||
f6feb48b JU |
1701 | if (batch.curlen > batch.limit) |
1702 | nl_batch_send(&batch); | |
67e3369e JU |
1703 | } |
1704 | ||
1705 | nl_batch_send(&batch); | |
1706 | ||
ac96497c | 1707 | dplane_ctx_q_init(ctx_list); |
67e3369e | 1708 | dplane_ctx_list_append(ctx_list, &handled_list); |
fef24b03 JU |
1709 | } |
1710 | ||
d4000d7b DS |
1711 | struct nlsock *kernel_netlink_nlsock_lookup(int sock) |
1712 | { | |
34869809 | 1713 | struct nlsock lookup, *retval; |
d4000d7b DS |
1714 | |
1715 | lookup.sock = sock; | |
1716 | ||
34869809 MS |
1717 | NLSOCK_LOCK(); |
1718 | retval = hash_lookup(nlsock_hash, &lookup); | |
1719 | NLSOCK_UNLOCK(); | |
1720 | ||
1721 | return retval; | |
1722 | } | |
1723 | ||
1724 | /* Insert nlsock entry into hash */ | |
1725 | static void kernel_netlink_nlsock_insert(struct nlsock *nls) | |
1726 | { | |
1727 | NLSOCK_LOCK(); | |
1728 | (void)hash_get(nlsock_hash, nls, hash_alloc_intern); | |
1729 | NLSOCK_UNLOCK(); | |
1730 | } | |
1731 | ||
1732 | /* Remove nlsock entry from hash */ | |
1733 | static void kernel_netlink_nlsock_remove(struct nlsock *nls) | |
1734 | { | |
1735 | NLSOCK_LOCK(); | |
1736 | (void)hash_release(nlsock_hash, nls); | |
1737 | NLSOCK_UNLOCK(); | |
d4000d7b DS |
1738 | } |
1739 | ||
1740 | static uint32_t kernel_netlink_nlsock_key(const void *arg) | |
1741 | { | |
1742 | const struct nlsock *nl = arg; | |
1743 | ||
1744 | return nl->sock; | |
1745 | } | |
1746 | ||
1747 | static bool kernel_netlink_nlsock_hash_equal(const void *arg1, const void *arg2) | |
1748 | { | |
1749 | const struct nlsock *nl1 = arg1; | |
1750 | const struct nlsock *nl2 = arg2; | |
1751 | ||
1752 | if (nl1->sock == nl2->sock) | |
1753 | return true; | |
1754 | ||
1755 | return false; | |
1756 | } | |
1757 | ||
1fdc9eae | 1758 | /* Exported interface function. This function simply calls |
1759 | netlink_socket (). */ | |
d62a17ae | 1760 | void kernel_init(struct zebra_ns *zns) |
1fdc9eae | 1761 | { |
47e2eb27 | 1762 | uint32_t groups, dplane_groups, ext_groups; |
5d307d5d DS |
1763 | #if defined SOL_NETLINK |
1764 | int one, ret; | |
1765 | #endif | |
d62a17ae | 1766 | |
026a316f DS |
1767 | /* |
1768 | * Initialize netlink sockets | |
1769 | * | |
1770 | * If RTMGRP_XXX exists use that, but at some point | |
1771 | * I think the kernel developers realized that | |
1772 | * keeping track of all the different values would | |
1773 | * lead to confusion, so we need to convert the | |
1774 | * RTNLGRP_XXX to a bit position for ourself | |
1775 | */ | |
1776 | groups = RTMGRP_LINK | | |
c317d3f2 SY |
1777 | RTMGRP_IPV4_ROUTE | |
1778 | RTMGRP_IPV4_IFADDR | | |
1779 | RTMGRP_IPV6_ROUTE | | |
1780 | RTMGRP_IPV6_IFADDR | | |
1781 | RTMGRP_IPV4_MROUTE | | |
1782 | RTMGRP_NEIGH | | |
1783 | ((uint32_t) 1 << (RTNLGRP_IPV4_RULE - 1)) | | |
1784 | ((uint32_t) 1 << (RTNLGRP_IPV6_RULE - 1)) | | |
1785 | ((uint32_t) 1 << (RTNLGRP_NEXTHOP - 1)) | | |
1786 | ((uint32_t) 1 << (RTNLGRP_TC - 1)); | |
d62a17ae | 1787 | |
ceab66b7 MS |
1788 | dplane_groups = (RTMGRP_LINK | |
1789 | RTMGRP_IPV4_IFADDR | | |
cd787a8a MS |
1790 | RTMGRP_IPV6_IFADDR | |
1791 | ((uint32_t) 1 << (RTNLGRP_IPV4_NETCONF - 1)) | | |
1792 | ((uint32_t) 1 << (RTNLGRP_IPV6_NETCONF - 1)) | | |
1793 | ((uint32_t) 1 << (RTNLGRP_MPLS_NETCONF - 1))); | |
1794 | ||
47e2eb27 CS |
1795 | /* Use setsockopt for > 31 group */ |
1796 | ext_groups = RTNLGRP_TUNNEL; | |
ceab66b7 | 1797 | |
d62a17ae | 1798 | snprintf(zns->netlink.name, sizeof(zns->netlink.name), |
1799 | "netlink-listen (NS %u)", zns->ns_id); | |
1800 | zns->netlink.sock = -1; | |
fe953d7c DS |
1801 | if (netlink_socket(&zns->netlink, groups, &ext_groups, 1, zns->ns_id) < |
1802 | 0) { | |
19d5a4fe DS |
1803 | zlog_err("Failure to create %s socket", |
1804 | zns->netlink.name); | |
1805 | exit(-1); | |
1806 | } | |
34869809 MS |
1807 | |
1808 | kernel_netlink_nlsock_insert(&zns->netlink); | |
d62a17ae | 1809 | |
1810 | snprintf(zns->netlink_cmd.name, sizeof(zns->netlink_cmd.name), | |
1811 | "netlink-cmd (NS %u)", zns->ns_id); | |
1812 | zns->netlink_cmd.sock = -1; | |
fe953d7c | 1813 | if (netlink_socket(&zns->netlink_cmd, 0, 0, 0, zns->ns_id) < 0) { |
19d5a4fe DS |
1814 | zlog_err("Failure to create %s socket", |
1815 | zns->netlink_cmd.name); | |
1816 | exit(-1); | |
1817 | } | |
34869809 MS |
1818 | |
1819 | kernel_netlink_nlsock_insert(&zns->netlink_cmd); | |
d62a17ae | 1820 | |
80dcc388 MS |
1821 | /* Outbound socket for dplane programming of the host OS. */ |
1822 | snprintf(zns->netlink_dplane_out.name, | |
1823 | sizeof(zns->netlink_dplane_out.name), "netlink-dp (NS %u)", | |
1824 | zns->ns_id); | |
1825 | zns->netlink_dplane_out.sock = -1; | |
fe953d7c | 1826 | if (netlink_socket(&zns->netlink_dplane_out, 0, 0, 0, zns->ns_id) < 0) { |
62b8bb7a | 1827 | zlog_err("Failure to create %s socket", |
80dcc388 MS |
1828 | zns->netlink_dplane_out.name); |
1829 | exit(-1); | |
1830 | } | |
34869809 MS |
1831 | |
1832 | kernel_netlink_nlsock_insert(&zns->netlink_dplane_out); | |
80dcc388 MS |
1833 | |
1834 | /* Inbound socket for OS events coming to the dplane. */ | |
1835 | snprintf(zns->netlink_dplane_in.name, | |
1836 | sizeof(zns->netlink_dplane_in.name), "netlink-dp-in (NS %u)", | |
1837 | zns->ns_id); | |
1838 | zns->netlink_dplane_in.sock = -1; | |
fe953d7c | 1839 | if (netlink_socket(&zns->netlink_dplane_in, dplane_groups, 0, 0, |
ceab66b7 | 1840 | zns->ns_id) < 0) { |
80dcc388 MS |
1841 | zlog_err("Failure to create %s socket", |
1842 | zns->netlink_dplane_in.name); | |
62b8bb7a MS |
1843 | exit(-1); |
1844 | } | |
34869809 MS |
1845 | |
1846 | kernel_netlink_nlsock_insert(&zns->netlink_dplane_in); | |
62b8bb7a | 1847 | |
5d307d5d DS |
1848 | /* |
1849 | * SOL_NETLINK is not available on all platforms yet | |
1850 | * apparently. It's in bits/socket.h which I am not | |
1851 | * sure that we want to pull into our build system. | |
1852 | */ | |
1853 | #if defined SOL_NETLINK | |
1854 | /* | |
1855 | * Let's tell the kernel that we want to receive extended | |
62b8bb7a | 1856 | * ACKS over our command socket(s) |
5d307d5d DS |
1857 | */ |
1858 | one = 1; | |
1859 | ret = setsockopt(zns->netlink_cmd.sock, SOL_NETLINK, NETLINK_EXT_ACK, | |
1860 | &one, sizeof(one)); | |
1861 | ||
1862 | if (ret < 0) | |
62b8bb7a MS |
1863 | zlog_notice("Registration for extended cmd ACK failed : %d %s", |
1864 | errno, safe_strerror(errno)); | |
1865 | ||
1866 | one = 1; | |
80dcc388 MS |
1867 | ret = setsockopt(zns->netlink_dplane_out.sock, SOL_NETLINK, |
1868 | NETLINK_EXT_ACK, &one, sizeof(one)); | |
62b8bb7a MS |
1869 | |
1870 | if (ret < 0) | |
1871 | zlog_notice("Registration for extended dp ACK failed : %d %s", | |
5d307d5d | 1872 | errno, safe_strerror(errno)); |
97f85144 JU |
1873 | |
1874 | /* | |
1875 | * Trim off the payload of the original netlink message in the | |
1876 | * acknowledgment. This option is available since Linux 4.2, so if | |
1877 | * setsockopt fails, ignore the error. | |
1878 | */ | |
1879 | one = 1; | |
80dcc388 MS |
1880 | ret = setsockopt(zns->netlink_dplane_out.sock, SOL_NETLINK, |
1881 | NETLINK_CAP_ACK, &one, sizeof(one)); | |
9781e6a0 DS |
1882 | if (ret < 0) |
1883 | zlog_notice( | |
1884 | "Registration for reduced ACK packet size failed, probably running an early kernel"); | |
5d307d5d DS |
1885 | #endif |
1886 | ||
d62a17ae | 1887 | /* Register kernel socket. */ |
19d5a4fe | 1888 | if (fcntl(zns->netlink.sock, F_SETFL, O_NONBLOCK) < 0) |
450971aa | 1889 | flog_err_sys(EC_LIB_SOCKET, "Can't set %s socket flags: %s", |
09c866e3 | 1890 | zns->netlink.name, safe_strerror(errno)); |
8c85e8ea DS |
1891 | |
1892 | if (fcntl(zns->netlink_cmd.sock, F_SETFL, O_NONBLOCK) < 0) | |
1893 | zlog_err("Can't set %s socket error: %s(%d)", | |
1894 | zns->netlink_cmd.name, safe_strerror(errno), errno); | |
19d5a4fe | 1895 | |
80dcc388 | 1896 | if (fcntl(zns->netlink_dplane_out.sock, F_SETFL, O_NONBLOCK) < 0) |
62b8bb7a | 1897 | zlog_err("Can't set %s socket error: %s(%d)", |
80dcc388 MS |
1898 | zns->netlink_dplane_out.name, safe_strerror(errno), |
1899 | errno); | |
1900 | ||
1901 | if (fcntl(zns->netlink_dplane_in.sock, F_SETFL, O_NONBLOCK) < 0) | |
1902 | zlog_err("Can't set %s socket error: %s(%d)", | |
1903 | zns->netlink_dplane_in.name, safe_strerror(errno), | |
1904 | errno); | |
62b8bb7a | 1905 | |
19d5a4fe | 1906 | /* Set receive buffer size if it's set from command line */ |
9fb83b55 DS |
1907 | if (rcvbufsize) { |
1908 | netlink_recvbuf(&zns->netlink, rcvbufsize); | |
1909 | netlink_recvbuf(&zns->netlink_cmd, rcvbufsize); | |
1910 | netlink_recvbuf(&zns->netlink_dplane_out, rcvbufsize); | |
1911 | netlink_recvbuf(&zns->netlink_dplane_in, rcvbufsize); | |
97f85144 | 1912 | } |
19d5a4fe | 1913 | |
80dcc388 MS |
1914 | /* Set filter for inbound sockets, to exclude events we've generated |
1915 | * ourselves. | |
1916 | */ | |
1917 | netlink_install_filter(zns->netlink.sock, zns->netlink_cmd.snl.nl_pid, | |
1918 | zns->netlink_dplane_out.snl.nl_pid); | |
1919 | ||
1920 | netlink_install_filter(zns->netlink_dplane_in.sock, | |
62b8bb7a | 1921 | zns->netlink_cmd.snl.nl_pid, |
80dcc388 | 1922 | zns->netlink_dplane_out.snl.nl_pid); |
62b8bb7a | 1923 | |
19d5a4fe DS |
1924 | zns->t_netlink = NULL; |
1925 | ||
3801e764 | 1926 | thread_add_read(zrouter.master, kernel_read, zns, |
19d5a4fe | 1927 | zns->netlink.sock, &zns->t_netlink); |
d62a17ae | 1928 | |
1929 | rt_netlink_init(); | |
1fdc9eae | 1930 | } |
1931 | ||
34869809 MS |
1932 | /* Helper to clean up an nlsock */ |
1933 | static void kernel_nlsock_fini(struct nlsock *nls) | |
1934 | { | |
1935 | if (nls && nls->sock >= 0) { | |
1936 | kernel_netlink_nlsock_remove(nls); | |
1937 | close(nls->sock); | |
1938 | nls->sock = -1; | |
1939 | XFREE(MTYPE_NL_BUF, nls->buf); | |
1940 | nls->buflen = 0; | |
1941 | } | |
1942 | } | |
1943 | ||
62b8bb7a | 1944 | void kernel_terminate(struct zebra_ns *zns, bool complete) |
1fdc9eae | 1945 | { |
146bcb9b | 1946 | THREAD_OFF(zns->t_netlink); |
d62a17ae | 1947 | |
34869809 | 1948 | kernel_nlsock_fini(&zns->netlink); |
d62a17ae | 1949 | |
34869809 | 1950 | kernel_nlsock_fini(&zns->netlink_cmd); |
ddfeb486 | 1951 | |
34869809 | 1952 | kernel_nlsock_fini(&zns->netlink_dplane_in); |
80dcc388 | 1953 | |
62b8bb7a MS |
1954 | /* During zebra shutdown, we need to leave the dataplane socket |
1955 | * around until all work is done. | |
1956 | */ | |
34869809 MS |
1957 | if (complete) |
1958 | kernel_nlsock_fini(&zns->netlink_dplane_out); | |
1959 | } | |
d4000d7b | 1960 | |
34869809 MS |
1961 | /* |
1962 | * Global init for platform-/OS-specific things | |
1963 | */ | |
1964 | void kernel_router_init(void) | |
1965 | { | |
1966 | /* Init nlsock hash and lock */ | |
1967 | pthread_mutex_init(&nlsock_mutex, NULL); | |
1968 | nlsock_hash = hash_create_size(8, kernel_netlink_nlsock_key, | |
1969 | kernel_netlink_nlsock_hash_equal, | |
1970 | "Netlink Socket Hash"); | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * Global deinit for platform-/OS-specific things | |
1975 | */ | |
1976 | void kernel_router_terminate(void) | |
1977 | { | |
1978 | pthread_mutex_destroy(&nlsock_mutex); | |
1979 | ||
1980 | hash_free(nlsock_hash); | |
1981 | nlsock_hash = NULL; | |
62b8bb7a | 1982 | } |
34869809 | 1983 | |
ddfeb486 | 1984 | #endif /* HAVE_NETLINK */ |